Monster who failed

Monster who is common as dirt. No, more common.

Monster who nobody saw die, so maybe they're still alive

Monster who thought they were safe

Monster who can't let you in. You're not on the list.

Monster whose name is Solo

Monster who always lies. Or was that tells the truth? Won't it be fun to find out together.

Monster who always tells the truth

Monster who always lies

Monster who is stuck in a hole