What is a monster that looks like a large ugly person and usually lives under a cave?

Ah, darling, you're talking about a good ol' ogre. They're big, ugly, and not the type you'd want to invite over for tea. They love hanging out in caves and scaring the living daylights out of anyone who dares to wander too close. Just be sure to bring your running shoes if you ever cross paths with one of those delightful creatures.