Greenobo, Purpbobo and Bluebobo are three recolored versions of Abobo.
Greenobo is based off Mibobo from the Double Dragon series (Abobo's origin). Meanwhile, Purpobo and Bluebobo originate from Abobo's Big Adventure.
In The Game
All three recolors are exclusive to the unlockable Abobo Battle, where all three recolors fight each other in over seven different arenas from other NES games (including Double Dragon), with only two players, along with Abobo. Each Abobo has their very own line if one of them wins the mode. The attacks of the recolored Abobos are taken from all of Abobo's attacks in Double Drabobo.