He’s a loner, they say. He keeps to himself.
He's a bit odd and remote, with a very flat affect.
Intelligent, but nervous and fidgety. Bright, but painfully awkward.
He has “episodes” that involve total withdrawal from whatever he’s supposed to be doing.
Somebody heard he has a disorder, and maybe it is Asperger’s syndrome.
You don’t know who his friends are. He scares you a little, doesn’t he?