Jasper my seem like a regular teenage highschool student. He's an attractive one as well, maybe not like other guys; on the football team, have a 6 pack, etc. But he has "that something" that may not attract many girls. In reality many girls get scared of him easily due to his such cold stare he got, the one that looks through you.
Jasper is always seen as a creep for it, he doesn't talk much, but he isn't an introvert or have social anxiety like many quiet students do, he just, doesn't feel like talking.
Jasper also has a pretty weird interest in killers, psychos, murders, gore. Everything a "normal" human would find disgusting, he finds it interesting. He's really smart in that field; murders, psychos, laws, types of murders, types of evidence, how to avoid getting caught, how to hide evidence. He really enjoys it.