BowlMan.EXE

BowlMan.EXE is completely made from things from bowling. In fact, he uses bowling balls and pins. He even turned in to a Darkloid because of it in the anime MegaMan NT Warrior. He is Rank 2 in MegaMan Battle Network 3 Blue/Black version, while MistMan.EXE is in his place in the White version.

MegaMan Battle Network 3
BowlMan is Rank 2 in the UnderNet and is battled in the Netbattle Machine in the TV Station. After being defeated, he'll give up his rank 2 and tell MegaMan where to find Serenade.EXE. BowlMan can be rebattled in that exact location.

MegaMan NT Warrior Axess
BowlMan first appears in Axess as a NetNavi in a bowling alley but a Darkloid presents him with a Dark Chip to help him improve his game. BowlMan then becomes a Darkloid after using it and battles on their behalf.