VenomMyotismon

Also called Venomvamdemon, of course, which rolls much nicer, Myotismon is actually said to dislike taking on this form, because his sophisticated and gentlemanly mannerisms give way to a more brutal bloodlust he considers embarrassing. It's a pretty cool design for a big giant Dracula Satan, with a lot of what still make Digimon look so monstrous and wild. Nice skeletal parts, exaggerated limbsand tattered wings, and the relatively normal guy head with just slightly unkempt hair actually looks pretty cool on a body like this too. I actually wouldn't prefer this design a creature-head.

The anime, however, reveals that there's a much smaller "true form" inside of Venomyvampdemyotisism....

...Hiding inside of his crotch.

This is never further explained and isn't mentioned in any official profile or featured in any other artwork. Venommyotismon just had a little round baby devil-head Digimon in its groin, and that's its true weak point. There was a fan theory that it's probably the real Baby I or Baby II Digimon that Myotismon descended from, but those aren't usually hanging out like little parasites inside their evolved forms...are they? Nonetheless, it's pretty interesting and memorable.

Digivolves from

 * 1) Myotismon