Mino

Mino (みのさん, Mino-san) is an animal whose body is situated inside the Protagonist's House. It appears to have been stabbed with a dagger by Hero, as the weapon was left behind.

Characteristics
Mino is a chubby, black creature that appears to be segmented by its head and body, much like a mushroom's cap and stalk. It has big round eyes on its head with black, wall-eyed pupils. A big red tongue sticks out from under its head.

Translation Differences
The last line from the Japanese text appears to have been omitted in the localized version. "そういうわけでゴミっぽい物が好物という話だ. ", would translate to, "That's why junk is it's favorite."

Hint
Being the president of trash, Mino can fit itself into nook and crannies somehow. It must be looking for garbage.