A specific species of Anti-Villain: a creature that could be called monstrous, but can't actually be viewed as evil, since it lacks any actual malice. This is not to say that they're not a threat; they're usually a literal monster, and if they're not dealt with, many people will die. It's just that, in theory, options besides killing the monster exist. See also Monster Is a Mommy, a Sub-Trope of when the monster in question is fully justified or even doing objective good in its monstrous actions. See also Why Isn't It Attacking? When the non-malicious behavior is noticed.