Dexter

Avatar source

Appearance
Dexter is, simply put, a Beheeyem, although slightly slimmer than the normal figure. He carries around a backpack.

Personality
His personality is so to speak bizarre. Often times he would rather focus more on his studies than much else. Anything to compromise the efforts of his work would result in an emotional wreck out of him. Above all of that, like all psychic types, he is intelligent, clearly knowing a lot of his stuff about stars and everything in space.

Origins
Dexter's origins are completely unknown. His birthplace, age, and any defining factors aside from appearance are completely unknown. Who is he?