YamatoMan.EXE

He is an Asteroid Navi given to Iriya by Slur.EXE.
He is used to steal ancient artifacts from museum collections that range from various armor pieces to various weapons. He later uses all the artifacts which he stole and fused them together into several weapons which are then used to attack both C.F. Rockman and C.F. SearchMan.EXE, but is deleted by them.

(Source: The Mega Man Knowledge Base)