Past its quirky sprites and cute poses lies an abomination that combines the animations and commands of Kung Fu Man, coding (claimed to be accidentally) taken from SuperMario64 and victory quotes taken from Satanchu's cancelled Bowser character.
Chespin uses coding taken from SuperMario64 and commands from Kung Fu Man; of course, the two are pretty much incompatible past the standard punches and kicks, as evident when Chespin seems to fire a clone of itself that simply passes through the opponent without taking or dealing any damage. Some clones follow the gravity rule of regular characters, fooling the human players into attacking the clone. Its attacks are also excessively overpowered compared to the average character, with some of its regular attacks chipping away more than quarter of the average character's maximum Life, though fortunately, it cannot combo its attacks. It also disappears on occasion when hit.
This character does not have any Special or Hyper Attacks.
This character does not have any palettes, instead using the palette of sprite 9000,0.
If one were to look through Chespin's .air file, they'd find many unfinished/unused attack animations that were presumably supposed be Special and Hyper attacks (two types of attacks that Chespin lacks).