Tenuki Chaud is one of the two alternate final bosses from the video game Aero Fighters 2/Sonic Wings 2 (the other being a moon-fish that appears very rarely). He is only described as an outer-space ghost mercenary, and it is unknown why he joined Fata Morgana in the first place.
Much like Osaru, Tenuki will appear as the final boss instead of Lar, and like all other final bosses in the series, the battle is timed, meaning failure in defeating him will earn the player a bad ending.