Inspired by the tabletop game AD&D (TM) ooze and gel type monsters, I present to you Gelatinous Ooze Man. After centuries of living underground, feasting upon industrious miners, lost explorers, and foolhardy adventurers, this creature has become sentient and is able to maintain the shape of a human.

While he might not be the "brightest crayon in the box" he at least had enough sense to slap on a slime wig and some moss... "clothes" to look more human. Got to give him credit, he's trying as he heads out on his first adventure above ground.