I know a quiet athletic guy that I've typed as ISFx but I'm still not that sure so help is greaaatly appreciated.
He basically is quiet but tends to seem loud when around loud people. But I've been observing for a while and he is actually not as loud as people thought. When with his friends he is quiet and observing the scene but doesn't comment much. He also doesn't men gossip unlike his friends and will try to distance himself from someone when he doesn't like him and finds him annoying. Even if his friend is at the bottom of the social chain, he still chooses to hang around with him etcetera instead of the other more acceptable groups that he could join. He kinda gets lost in thought and gets unaware of what's happening at times. Very fast reflex though. Disorganized as fuck. Stands up for himself when needed but mostly easygoing and chill.
His sense of humor is more goofy. Sometimes he can go overload with the fun and screw things up for a bit but isn't afraid of accepting that mistake. Gets position as 'butt of the joke' when his daydreaming tendencies causes him to drop his phone into a waste container, for example. He is really good at physical activities and constantly pushes himself to practice the same things over and over to achieve results.
Feel free to ask more questions, thanks if you helped