Constellation:

Character:

He has a recognizable attire of a blue trenchcoat-length school uniform jacket with yellow chains on the collar.He also wears a trademark blue hat which, while torn in the back, often seems to blend with his hair. While they are first shown as being completely separate, later publications cause more uncertainty as to where his hat and his hair actually meet. His hat is most likely a Japanese student cap that was normally worn along with the gakuran prior to the 1970s.He is also known for a quick and short temper.

Source from Wikipeida