Among the people you've encountered irl

Describe the most "off" or "unique" person you've seen/known where if someone asked what your impression of them is, all you can really say is "*name* is just being *name* you'll know when you meet them".

There was one classmate of mine who I've spent like a big chunk of my years in school with and not once did I feel comfortable around him. Whenever I'd talk to him it'd like I was being dissected and observed like a lab experiment. If I had to describe him he constantly switches between being a friendly guy who's generous/respectful and a verbally unpredictable, unhinged, flirtatious (guys and girls, he'll say shit to whoever he's chatting with) , out-of-pocket, gets in your space, serial-killer vibes sort of guy.

His respectful side is like the typical popular nice guy in stories who asks normal, surface level questions and gives good advice if you ask him. But his other side? It's like a combination of the MC from Golden Boy (english dub), the naked bubble butt clayman from that "Hey Stranger" youtube video, and filthy frank/pink guy.

He was good-looking/pretty, smart, interested in world affairs, and he was friends with many of the other childhood classmates and they were much more normal. They'll say jokes with shock factor our of irony (not to the extent of him), but when it comes to discussions with teachers it's clear that they care about human rights/equality and aren't incels.

So he isn't associated with any sus people but he's definitely unsettling because of his words and his vibes without any actual red flags. Lots of people found him attractive anyways (I can't argue against the physicality part), and it really weirded me out.