Chao

A Chao (pronounced IPA-tʃaʊ', or "chow", singular and plural form Chao) is a lifeform from the Sonic the Hedgehog video game series. Their role in the games are to be raised by the player in mini-games, similar to many virtual pets. Chao are somewhat complex, responding to stimuli, they have moods, they require food, and they can be loving or fearful. The word chao is a pun on chaos, a word commonly used in the Sonic series.

Making their first appearance in Sonic Adventure for the Dreamcast (both in the plot and in a Chao-raising aspect of the game), later in Sonic Adventure 2, and further enhanced in Sonic Adventure 2: Battle, Sonic Advance and Sonic Adventure DX, Chao have recently come to be a large part of the Sonic the Hedgehog franchise. Chao-raising and the main Sonic games tie together in a number of ways: items which you encounter in the main game can be used to raise your Chao, collected Rings can be used to buy things for them, and several unlockable features are related to Chao. During raising, Chao have statistics: Swimming, Flying, Running, Power, and Stamina, as well as a number of other things which aren't quite as obvious. These statistics can be raised through proper Chao raising, and will enable a Chao to do better in their competitions: Chao racing and Chao karate.

Chao have appeared in plenty of Sonic the Hedgehog games, including Sonic Adventure, Sonic Adventure 2, Sonic Adventure 2: Battle, Sonic Advance, Sonic Advance 2, Sonic Advance 3, Sonic Pinball Party, Sonic Shuffle, Sonic Adventure DX: Director's Cut, Sonic Heroes, Sega Superstars,Sonic Rivals 2,Sonic Chronicles: The Dark Brotherhood, A mission in the 360 & PS3 Versions of Sonic Unleashed and ''Shadow the Hedgehog. Earlier forms of the technology behind them, were also in NiGHTS Into Dreams with the Nightopians (the A-lives).

Life cycle
Chao start life in an egg state. The eggs of a common Chao are white with a yellow splotch on the top and blue freckles. Eggs other than those acquired in visiting a Chao Garden for the first time or mating are colored differently and reflect how the Chao will look. For example, a Gold Egg is solid gold in color and will hatch a solid gold Chao. Ways of hatching them include snuggling the egg (the kindest way), throwing the egg at a wall (the Chao will obviously not like this), and of course, simply waiting for the egg to hatch on its own. When they hatch, they can be trained to have different attributes and emotional states. The Chao from Sonic Adventure 2, Sonic Adventure 2: Battle and Sonic Adventure DX can also favor "dark" and "hero" sides as well as the default "neutral" side which can lead to variations in visual evolution. Depending on the game, they take varying times to evolve. A Chao can also lose five minutes of its life by feeding it Heart Fruits, or gain ten minutes by eating Strong Fruits.

When evolving, they go into a cocoon state, which is white in the SA2 Dreamcast version of the game and blue for the GameCube version (both shaped like a chao's head). When they come out of this cocoon, (they will be in there for approximately 1 minute) the Chao is an adult, and can mate, which is curious for their apparent gender neutrality. After about 15-20 hours of time spent with the Chao, it will either re-incarnate into an egg again if it is treated kindly (into a pink cocoon - it will remember the player and all, but it will have only 10% of its old stats) or die if abused (gray cocoon).

Evolution
After one Chao year has passed (about 2-3 hours for GameCube versions, 1 hour for Dreamcast) Chao create a cocoon and evolve into a more mature form. It will mature into a form that features both its highest leveled stat (running, swimming, power, flying or normal) and its alignment. During this evolution, a Chao raises one grade up in the level of its type, e.g. a swimming Chao who has a grade 'B' in swimming becomes an 'A'.

Alignment is determined by how the Chao was treated before its evolution, and the three alignments are Dark, Hero, and Neutral. There are three Hero characters (Sonic, Knuckles, and Tails) and three Dark characters (Shadow, Rouge, and Dr. Eggman) in Sonic Adventure 2. Petting, holding, or cuddling a Chao with a character makes the Chao favor the character's alignment. Attacking, throwing, stepping on a Chao, or taking its food while it is eating makes it favor the opposite alignment of the character. Every three times that a heart appears above a Chao's head and replaces the standard emotion, the Chao darkens or lightens a shade, a darker shade coinciding with becoming a Dark Chao, and vice versa. A Chao's physical appearance is the chief indicator in understanding the alignment of a Chao. Dark Chao have leathery wings and a devil's tail, and are colored black, brown, and red with a small spike ball on its head. Hero Chao have feathery wings, a split tail, and a small halo on its head. They are colored white, blue, and gold. Neutral chao are created by balancing contact by both Hero and Dark characters, or not paying attention to them. They are able to look like a lot of different characters. In Sonic Adventure DX, due to only heroic characters being playable, the Chao instead become Hero or Dark depending on the fruits it is given.

Chao will evolve a second time after 4-5 Chao years. However, the Chao won't go into a cocoon, and the changes are sometimes very subtle. A Chao will 'evolve' depending on which stat is the highest at the moment. However, it won't change its primary type. You can also change a Chao that has already gone through its second evolution. For examle, if you had a Dark/Fly Chao and gave a lot of purple Chaos Drives/Animals it would become a Dark/Fly/Fly Chao. However, if you then gave it Red Chaos Drives/Animals, its appearance would change again, and it would become a Dark/Fly/Power Chao.

After four to five Chao years have passed, the Chao will either reincarnate or die. If the Chao has lived a happy life, it will be surrounded by a pink cocoon, and will be reborn as a Baby Chao. However, a Chao that has been ignored and abused during its lifetime will surround itself with a gray cocoon, that will leave nothing behind after vanishing.

Besides the normal evolutions, a special Chao called the Chaos Chao can be created. This can be done once the selected Chao has reincarnated two times. During that third life, if it is given one of each animal in the game, but given NO chaos drives, it will become a Chaos Chao. Besides looking different than a normal Chao, the Chaos Chao has an unending lifespan, except a death through extreme character abuse (not proven). In Sonic Adventure 2, there's also the Hero Chaos Chao, also known as the "Angel Chao", and Dark Chaos Chao, also known as the "Devil Chao", along with the normal Neutral Chaos Chao (shaped like Chaos) from the original Sonic Adventure. Evolution works in the same manner, except you give them one animal from either the Hero or Dark characters respectively, and that no Chaos Drives must be given to them. Along with their apparent invincibility, Chaos Chao also lack the ability to reproduce.They are probably the most difficult chao to create the best way to make sure you've gotton all animals is to make a checklist.

Reproduction
After evolving, Chao gain the ability to reproduce. Chao have no gender and therefore can breed with any other adult Chao. Chao are in mating season when they sit down happily and are surrounded by a circle of flowers. While this happens twice naturally, it can also be achieved by purchasing 'Heart Fruit' from the Black Market in Sonic Adventure 2 and giving it to an adult Chao). Placing another Chao inside the circle may result in breeding. Most Chao are compatible, a Hero Chao can breed with a Dark Chao, and vice versa. It is believed that, to at least some degree, statistics and other characteristics are inherited. As mentioned above, Chaos Chao cannot breed.

Chao Stats
By giving a Chao a small animal, it will acquire some of the animal's characteristics. Besides a physical change to the Chao, this will also modify the Chao's stats based on the type of animal given. There are five types of animals in Sonic Adventure and 7 in Sonic Adventure 2. They consist of Running (Green), Power (Red), Swimming (Yellow) and Flying (Purple). The fifth color, Blue, is a fairly even mixture of some or all of the other classes. The two additional types featured in Sonic Adventure 2 are Ghost (Black) and Imaginary (Gold), sometimes called Legendary. The Ghost animals raise Intelligence and Imaginary animals raise luck (These two stats cannot be seen). The Ghost and Imaginary animals give better than average stat increases and do not lower any stats.

In Sonic Adventure 2, Chaos Drives appear. Chaos Drives are items that pop out of machines created by the military organization G.U.N. when they are destroyed. These, like the small animals, also raise your Chao's stats. These are only in Sonic Adventure 2 and the GameCube adaptation. Like the small animals, the different colors each raise a certain stat. Yellow raises swim, purple raises fly, green raises run, and red raises power.

However, neither animals nor Chaos Drives can raise a Chao's stamina, only food can. Also, a certain fruit called the Chao Fruit raises all stats, including Stamina, when it is given to a Chao.

Rebirth
In certain games like Sonic Adventure 2 Battle (after the evolution into a Hero, Neutral, or Dark Chao), Chao go into an either pink or gray cocoon. The pink means they're going to be reborn as themselves, the gray means they're going to die. On the upside, you get to keep all the letter grade status, like A's, B's C's, and such. The downside is that you have to refill their Stamina, Swim, Fly, etc., gauges back up to their full amount.

Sonic Adventure/DX

 * Station Square - This garden is the simplest, with a small water pool. This is also where one accesses the Chao races. It is found by entering the hotel and using the left elevator. In DX, a Black Market is added.
 * Mystic Ruins - This area is very large and complex, with stone relics and a small platform accessible by a wooden bridge, along with a waterfall. It is found by going behind Tails's laboratory and taking the mining cart in the cave. In DX, the water is slightly more shallow and the bridge has been removed.
 * Egg Carrier - An island surrounded by water. This one tends to have problems of animals leaving the game's boundaries and getting stuck. To find it, go inside the Egg Carrier and go to the door with the buttons in front. Step on the buttons in the "secret" password's order, which is "Eggman", and then go in the door and use the teleporter. In DX, the water is significantly more shallow.



Sonic Adventure 2/Battle

 * Neutral Garden - A peaceful looking Garden where the Chao Races take place in a cave called the Chao Stadium. This one is unlocked as soon as you get a Chao Key and finish the level you found it on. In Battle, there is also Chao Karate in the cave.
 * Hero Garden - Another peaceful Garden. To get this raise a Chao into a Hero Chao. It has a small castle your Chao can fly from, a fountain (that your Chao uses to swim in), and a few broken pillars. The music in the Hero Garden is different from the Chao Garden, with the same rhythm, but added sound affects to make it echo and sound comforting. Sometimes described as "Chao Heaven". In Battle, the bridge and river are missing, but the pool is bigger.
 * Dark Garden - Not as serene as the others, it has some graves and a steel fence on some of the walls. It also has a tree with a cage hanging from it where you can put your Chao (it can, however, escape), a pool of "blood", and a small island on the other side of the "blood". The music presented in the Dark Garden is very demented and has no rhythm with the other two gardens. There is also a mountainous region outside of the actual Dark Garden, with a mountain shaped in the face of a bat or demonic creature. A Dark Chao is needed to get it. Sometimes described as "Chao Hell". In Battle, the cave is gone.

The Chao Gardens in Sonic Adventure and Sonic Adventure 2 have the ability to send Chao to an attached VMU (Visual Memory Unit), and play with the Chao away from the Dreamcast in a game called Chao Adventure. The Chao walks on a path and is given a task. If done correctly, you are rewarded with a fruit or seed which can be taken off the VMU and back onto Sonic Adventure 2 for planting. Seeds can be planted by a Chao with a shovel and a watering can. The shovel can be won in races in Sonic Adventure 2. On Chao Adventure, you can also attach two VMUs to mate Chao, check the stats of your Chao, and name it. In Chao Adventure, the Chao doesn't age like it does in gardens.

Sonic Chronicles
In Sonic Chronicles there is a chao garden where all chao that you have found can be viewed and equipped. However, as in Sonic Advance 3, the garden is only for storing chao, not interacting with or raising them. Taken out the of the garden, however, they bond with the character you attach them to, and power them up.

Other Appearences
Sonic Advance, Sonic Advance 2 and Sonic Pinball Party also have a Tiny Chao Garden of its own, which is a small simple garden with a small pool that is universal to every game. There is a shop where fruit and toys can be bought for the Rings that the player has collected during gameplay, and some minigames. The Chao can be transferrable between these games and Sonic Adventure DX and Sonic Adventure 2: Battle via a GameCube/ GBA link cable.

Also, Sonic Advance 3 has a Chao Garden, but it is not for raising Chao. Instead, it is an area where the hidden Chao that the player has found during gameplay are located. When all ten of the Chao in the zone are found, the player can look for keys that enable the Special Stage for that particular zone. If the Chaos Emerald is obtained for a Zone, then it will be seen floating in the Chao Garden of the Zone it was found in.

In Sonic Unleashed, there is a Day mission in Spagonia that has Sonic collect ten Neutral Chao.

In Sonic X, there is a Chao Garden in Mr. Tanaka's childhood town.

Treating
Chao are kept happy if they're petted, fed, and generally taken care of. If a Chao is treated well by a character, it will skip towards that character and will nuzzle next to it sometimes. It will also happily come to you when you whistle, and when held, will fidget with glee. This means that your Chao loves your character and in the case of the nuzzling, is asking for attention. The Chao will also jump up and down and giggle happily at your presence.

On the other hand, Chao abuse is a somewhat strange form of Chao raising, in which one abuses their Chao. This can be done in a manner of ways, such as starving a Chao, leaving it in the water when it cannot swim, or simply inflict physical harm upon it. Chao abuse usually decreases the lifespan of the Chao, and the Chao dies when it comes time to reincarnate. Players generally abuse Chao either because they enjoy it, or to "help" a Chao change alignment by abusing it with a character of the opposite side. However, mistreatment is in no way necessary in order to change a Chao's alignment, as treating them kindly with a character of the desired alignment works just as well. However, it is the ONLY way to get masks (not added animal features) off your Chao.

If a Chao is treated poorly by the character, it will usually stand and shiver in fear if the abusing character is close by, and when held, will try to squirm out of the character's hands(this could also mean that you haven't fed it). If the Chao has been particularly abused, it might run away screaming from the abuser, run up to them and attack them (this has no effect on the character), or start crying.

Other Chao

 * Monotone Chao are Chao that are a single color, which will not change, even if it is evolved or given Chaos Drives/Small Animals. They can be bought at the Black Market and come in colors such as Red, Pink, Lime Green, and Black.


 * Shiny Chao are shiny versions of Monotone Chao that can also be bought at the Black Market for a higher price. If a Shiny Chao is bred with a Normal Chao, there is a chance of getting a Shiny Normal Chao, a shiny version of an ordinary Chao.


 * Jewel Chao are the Chao that can only be bought in the Tiny Chao Garden and Sonic Adventure 2's Black Market. They are very similar to Shiny Chao except that they are metallic instead of shiny and almost look like jewels. Jewel Chao come in colors such as Peridot, Gold, Amethyst and Onyx.

In Sonic Adventure DX, a Gold Chao, a Black Chao, and Silver Chao can be obtained.


 * Two-Tone Chao are unique Chao that can only be obtained by breeding a Monotone with a Normal Chao. They have a 'main' color like Monotone Chao, but also have small a blend of other colors. There is a Two-Tone version of every Monotone Chao. It can be difficult to tell whether a Chao is Two-Tone or Monotone, as there is sometimes little difference between the two. Normal Chao are also considered Two-Tone as they aren't a single color. If a Shiny Chao is bred with a Normal Chao, there is also a chance of getting a Shiny Two-Tone Chao.

White Two-Tone Chao are unique in that they look exactly like Normal Chao when they are hatched, but depending on what they evolve into, they will look much different. For example, if a White Two-Tone Chao evolves into a Neutral Run Chao, instead of being light green, it will be white with blue streaks, pink limbs and a yellow stomach.


 * Transparent Chao are unique Chao that are completely invisible expect for their eyes, emotion ball, wings and medals (if any). They can be obtained by breeding a Shiny Yellow or Shiny Grey Chao with a Jewel Chao.


 * Translucent Chao are Chao that are partially see-through. They can only be obtained by breeding a Jewel Chao with any other Shiny Chao.


 * Character Chao are unique that greatly resemble three characters: Tails, Knuckles, and Amy. The Knuckles and Amy Chao are only available through hacking, although the Tails Chao can be obtained via Phantasy Star Online. They are immortal, can't breed, and aren't affected by animal parts.

Although not official Character Chao, Neutral/Run/Run, Dark/Run/Run, Neutral/Fly/Fly, and Dark/Fly/None Chao greatly resemble Sonic, Shadow, NiGHTS, and Reala respectively.
 * Chaos Chao are chao that are immortal. These can be obtained by getting a Chao to be reborn twice, then feeding it all 21 animals (no more, less, or chaos drives!). When the Chao evolves, it will become a Chaos Chao.

Cameo appearances

 * In Sonic Adventure, a poster found outside Casinopolis advertises a film called "Chao in Space". This may be a reference to Lost in Space, and the poster resembles the posters for the movie 'Muppets from Space.
 * In Sonic Adventure 2, posters in the City Escape stage advertise "Chao in Space 2", featuring a Hero and a Dark Chao. The poster also mentions that it is "now on DVD".
 * Also in Sonic Adventure 2, a billboard with a Chao on it can be seen beside the road in the Kart Racing stages and mini-game. The billboard reads "Drive Safety!" instead of the correct "Drive Safely!"
 * Also in SA2's City Escape, there is a Planet of the Chaos poster similar to the front cover of the 2-disc Planet of the Apes.
 * Also in SA2, a neutral Chao is playable in the 2-player shooting mode. In the Gamecube version, there's also a Dark Chao who replaces Big the Cat.
 * A neutral Chao is a playable, secret character in Sonic Shuffle for the Dreamcast.
 * In Sonic Heroes, Chao appear in odd numbered Special Stages, where a Neutral Chao and a Dark Chao float in front of the characters in a hot air balloon. The Neutral one throws power orbs to help the characters, while the Dark one throws mines.
 * Also in Sonic Heroes, Team Chaotix are given several missions that consist of finding and rescuing Chao.
 * In Shadow the Hedgehog, dozens of Chao can be found frolicking in Doctor Eggman's Cryptic Castle base. They can be attacked, which makes them cry and slightly raises Shadow's "dark" meter. Cheese can be attacked, too, but once simply touched is considered to be rescued.
 * In the 2006 Sonic the Hedgehog, a rusted Chao billboard can be seen being blown around by the tornado in Shadow's glider section of the "Crisis City" stage.
 * Also in Sonic the Hedgehog, the first rusted sign Silver uses as a platform in the first section of his "Crisis City" stage says "Chao Garden", though it is difficult to tell.
 * In Phantasy Star Universe there are rare monsters called "Jao" which looks like a more vicious version of a Chao. The Phantasy Star series was also created by Sonic Team.
 * In the game Billy Hatcher and the Giant Egg, a Chao appears as an Egg Animal for the first mission in the game.
 * In Sonic Chronicles: The Dark Brotherhood, Chao are power ups.
 * In Sonic Unleashed a mission in Spagonia makes you collect ten Neutral Chao as Sonic the Hedgehog. Also, a travelling salesman by the name of Wentos in the game carries around a Chao puppet in his right hand, acting as if it has a mind of its own and occasionally talks to it.

Trivia
The reason for this happening, may be because they were going to make a brand new model of a head with the pacifier, rather then just make a model of the pacifier by itself, and have it be put on the Chao's head like you would think it would. But, since they scrapped the pacifier, they never bothered making the Chao-pacifier combo model. So the game's using a model that doesn't exist.
 * Through a secret mission in Phantasy Star Online Episode I &amp; II, another game created by Sonic Team, it is possible to receive a "Tails Chao". This chao resembles Tails to a great extent and cannot die or reproduce, much like a Chaos Chao.
 * On the Sonic Adventure 2 official soundtrack (Multi-Dimensional), there is an instrumental song with Chao singing (or rather making Chao noises) in the background. This song plays in Chao Kindergarten for SA2 and SA2: Battle.
 * A person by the nickname "Tyro" has created a VMU minigame for editing Chao (Dreamcast only). It allows you to change many aspects of your Chao including their stats, appearance, items, etc. Although it is a tad difficult to use on the VMU because either Internet access is required on that particular Dreamcast, or a free VMU Tool program which is able to be burned onto a CD with the editor files.
 * Ironically enough, the Dreamcast version of Sonic Adventure states that the Chao Gardens were created in protected environments. However, it is possible to drown when playing as the character Tails in either water pool in the Egg Carrier or Mystic Ruins Chao Gardens. It is also possible to die by jumping off the cliff or throw a Chao off to make it disappear in the Mystic Ruins Garden. These glitches do not exist in the remake. If a character falls out of a garden by using other glitches in Sonic Adventure DX, he or she will appear in the middle of the garden without dying.
 * It is possible to move a Chao from a GameCube into a Game Boy Advance without a Sonic Advance game. This creates a temporary Tiny Chao Garden, and is useful for moving Chao between Sonic Adventure DX and Sonic Adventure 2: Battle.
 * In Sonic Adventure DX, a monitor in the Station Square Chao Garden can bring up a hint menu. One of the hints is to watch the Chao's stamina bar, even though this stamina bar is from Sonic Adventure 2, and isn't in either version of Sonic Adventure.
 * Originally, a pacifier was meant to be an accessory for a Chao, but was scrapped for unknown reasons. The Pacifier can still be used by using Gameshark cheats, but it makes the Chao's head invisible.
 * The Chao appear in Sega Super Star Tennis at Green Hill Zone. It is possible to hit them with a tennis ball. If you manage to hit them, they bounce up and flip upside down then land on their feet.
 * Despite their cute aspect, some Chao appear to have pointy teeth (reminiscent to those of a crocodile, but perfectly aligned).