Egg Pawn

The E-1001 Egg Pawn, usually referred to simply as Egg Pawns (エッグポーン), first appeared in the game Sonic Heroes and are a part of Dr. Eggman's E-Series, his latest series of Badniks. They come in different varieties, each having its own unique abilities, and serve as Eggman's foot soldiers. The Egg Pawns are also the first type of Eggman Robots that are not powered by animals. The Egg Pawn also shares more than a passing resemblance to EggRobo.

Sonic Heroes
The Egg Pawn model first debuted in Sonic Heroes. They serve as the most common enemy in the stages and also may come equipped with a lance, machine gun, or laser. Some of them have shields that can come in three different styles: rock, metal, and heavy metal. Egg Pawns carrying lances will charge you while the ones wielding lasers and machine guns will fire without changing position.

Shadow the Hedgehog
The Egg Pawn appeared again in Shadow the Hedgehog, where they work on Dr. Eggman side in the war against the Black Arms and in the doctor's hunt for the Chaos Emerald. In this game, they also wield weapons which can also be used by Shadow. They can be picked up from defeated Egg Pawns.

Sonic Rush
Egg Pawns also serve as enemies in Sonic Rush. This time, they had different color schemes to match the weapon (or, indeed, no weapon) they carried and in this game they're powered by Animals unlike the other games. Strangely, they seem to run much faster in this game.

Sonic Unleashed
While the Egg Pawn did not appear in Sonic Unleashed, a new type of enemies called Egg Fighters appeared in their place. They, and its variants seem to be the equivalent to Egg Pawns as they bear a similar appearance, abilities and functions.

Sonic Colors
The Egg Pawns also appear in the Wii and DS exclusive Sonic Colors as common stage enemies as seen in gameplay trailers. Like in Sonic Heroes, their design is different based on every level. They also have a slightly different appearance, where their arms have a different color, and they are bulkier.

Sonic Generations
They appear again in Sonic Generations in the levels Seaside Hill, Tropical Resort, and Planet Wisp. Their weapons and appearance are based on what era they appear in.

Mario and Sonic Series
The Egg Pawns also appear in Mario & Sonic at the Olympic Games as enemies that the player can shoot in the Dream Shooting competition. In this game, Egg Pawns are similar to Goombas from the Super Mario series.

Egg Pawns also appears as goalies in Mario & Sonic at the London 2012 Olympic Games. They are color coded for what team they're on.

Egg Knight
The Egg Knights are gold plated Egg Pawns that typically wield lances and lead a small group of Egg Pawns. They have more stamina than ordinary Egg Pawns and are usually found in positions where it is difficult to reach them without alerting any regular Egg Pawns nearby. This is because the destruction of an Egg Knight will result in any and all Egg Pawns in the nearby area being automatically destroyed with it.

Casino Pawns
These are casino themed Egg Pawns that appear in. There are three variants known such as the neon blue Casino Managers with black tie suits, neon pink Casino Bunnies, and neon green Casino Clowns that have weird meters above their heads, and typically wield machine guns. They appear in the fifth and sixth levels and third boss of Sonic Heroes ( Casino Park, BINGO Highway  and  Robot Carnival  respectively).

Egg Flapper
In Sonic Heroes, there was also another enemy known as the Egg Flapper. These enemies look similar to Egg Pawns, except they fly. Again, they were featured in Sonic Rush. and they also appear in Sonic and the Black Knight as enemies in the legacy missions. They serve as the only enemies that can be destroyed with a homing attack. The Egg Flappers cannot be destroyed by any sword attacks, possibly due to not being in Arthurian Legends.

Weapons and Equipment
Egg Pawns wield rapid fire blasters, single shot cannons and lances in Sonic Heroes, semi automatic blasters and bazookas and lances in Shadow the Hedgehog (they use the same models from Heroes) and in Sonic Heroes, Egg Pawns also carry shields sometimes which can be rectangular, round with spikes, or stone.

Trivia

 * The Egg Pawn being brought back for Sonic Colors could be because of their less menacing look. Eggman probably wanted more friendly looking robots to work at the Interstellar Amusement Park so people wouldn't suspect his evil plans.