I tried to make a story for this guy lol

His costume was inspiered by Splinter Cell Blacklist spy costumes

Rayman and his team aren't the only secret agents in the Glade of Dreams. This sneaky lil fella works alone inventing his own equipments and hacking computers/closed door. He always strives for perfection when he is on a misson.Mostly uses sniper rifle, cameras, smoke b, emp to disable enemy cameras/bots.His hideout is in an unknown location. At the end of the day he returns to his normal routines and chases/annoys Rayman while he is laughing to himself that he doesn't know that he is a spy.

Dark Rayman from: Rayman Legends (c) Ubisoft