BeastMan.EXE

One of the Darkloids spawned from darkness under ShadeMan, SavageMan fights against MegaMan and his friends as he tries to tear down the world to make it a place solely for Darkloids.

BeastMan.EXE was revived as an Asteroid Navi by Duo and given to Takeo Inukai by Slur when Takeo is reprimanded for mistreating the animals under his care. The two join the Neo WWW where they begin to wreak chaos and confusion in society.

(Source: The Mega Man Knowledge Base)