Bark the Polar Bear

Bark the Polar Bear (バーク・ザ・ポーラーベアー) is a playable character in Sonic the Fighters. He is an anthropomorphic yellow polar bear who competed in a fighting tournament for the Chaos Emeralds and the right to destroy the Death Egg II. He specializes in throws and flattering an opponent which compensates for his low speed.

History
Bark was one of the participants in a fighting tournament when Dr. Robotnik constructed the Death Egg II to conquer earth with his robots. He is found as opponent in Aurora Icefield. If Bark won this tournament, he would get the Chaos Emeralds belonging to the other participants in addition to his own and earn the right to use them for Tails' single-seat Lunar Fox which would take him to the Death Egg II to destroy it.

At the end of the tournament, the victor used the Chaos Emeralds to go to the Death Egg II and made it self-destruct moments after escaping it.

Sonic Generations
In the console/PC version of Sonic Generations, Bark makes a cameo appearance as one of the characters in the wanted posters alongside Bean the Dynamite dotted throughout the City Escape.

Fighting Vipers
Bark breifly appears as toy in Sega Saturn version of Fighting Vipers. He is only visible from the waist down during the intro of the game.

Fighters Megamix
Bark also makes appearance as an unlockable character in Fighters Megamix, along with Bean the Dynamite. He is unlocked after clearing the 'Muscle' submode of the arcade mode and he plays like any regular Virtua Fighter character in the game. He also has alternate costume is a Santa Claus-esque suit. His home stage Aurora Icefield from Sonic the Fighters.

Shenmue and Shenmue II
Bark appears as a collectible small toy in both Shenmue and its sequel Shenmue II (misspelled as "Berk") along with all characters from Sonic the Fighters, sans Honey the Cat.

Powers and abilities
Bark's main asset is his immense brute strength which is easily on par or greater than Knuckles the Echidna's, allowing him to flatten opponents and deal maximum damage with little effort. Bark also has the ability to harness chaos energy from the Chaos Emeralds to bolster his innate abilities, allowing him to enter Hyper Mode.

Bark is a good close range fighter in hand-to-hand combat, matching the likes of renowned fighters like Sonic and Knuckles. His fighting style specializes in brute strength with grappling throws and powerful punches, though he does utilize a few combo attacks.

Archie Comics
In the Sonic the Hedgehog comic series and its spin-offs published by Archie Comics, Bark is the silent partner of Bean the Dynamite. Bark himself was a walking enigma as no know knew where he came from or what his motivations are. He used to be part of a mercenary group which included Fiona Fox, Bean and Nic the Weasel. Later on, Bark and Bean were hired by Dr. Eggman to ambush Sonic on his birthday, but the duo was soon outnumbered and retreated. After being captured and escaping jail, Bark and Bean worked for Mammoth Mogul for some time before joining Nack the Weasel's Team Hooligan to secure a Sol Emerald, but failed.

Following the events of Worlds Collide, Bark became nearly indistinguishable from his game counterpart. During the Shattered World Crisis, he and the Hooligans would aid Dr. Eggman to control the world's restoration.

Trivia

 * Bark made a cameo on the front cover of Sonic X #15 in the form of a stuffed toy, along with Storm the Albatross and Amigo.
 * His home stage theme Fairy of A.I.F has been remixed and can be found as unlockable song in Sonic Gems Collection.
 * In Sonic the Fighters, Bark's fur in his character select picture is darker than his in-game model.
 * According to an interview on Sonic Central, Sonic doesn't know the whereabouts of Bark, Ray the Flying Squirrel, Bean the Dynamite, Nack the Weasel, Chaos or Tikal.
 * Like Bean and Honey the Cat, Bark has been most likely designed by Masahiro Sugiyama, the character designer of Sonic the Fighters.