Fan Casting Cloudcuckoolander in Sort by Tropes

A character with their head in the clouds. They are very cheerful and strangely oblivious to things that everyone else takes for granted. They may have an argument with themselves for fun, make points in an argument with no basis in logic or reality, or tell rambling stories that have nothing to do with the point they're trying to make. They make totally unintentional double entendres, and are great for Getting Crap Past the Radar. Sometimes also called "Space Case" or "Space Cadet", or plain old "Strange", a cuckoo clock chime is used as an indicator of one.