How about some kind of troll/ogre that camouflage itself against its surroundings. Large, strong, hard to spot, so it's a challenge to fight, but at the same time slow and a bit stupid so it's not impossible to defeat it.
Or some kind of creepy floating octopus thing that can people trap in its tentacles, trapping their arms so they have to rely on their friends to rescue them?
A kind of colourful peacock-like bird that has some limited telepathic powers (influencing feelings rather than thoughts and used to make possible victims calm and lethargic) and can hypnotize people with the pretty pattern of its plumage?
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Yes, I am serious about that avatar...