Sebastian

Sebastian is a demon hired into this world. He spent several years as the servant of a rich boy, and it made his bond with dragons stronger. His sould tasted exceptionally good, too. A demon has a "soul form", but can take on any form they want to further their goals. Sebastian's sould form is catlike, and so he chose a familiar form: tundra.

Grell is obsessed with Sebastian, but he clearly don't want her attention. Overly attached psycos are not his type. Cute girls with a personality split between that of a confused girl and a demon from the otherworld, however, fits him fine. Especially if she is a tundra who likes to be naughty with him. In the beginning he was interested, later he was captivated and confused, and in the end he found the situation to suit him well. He does not want the demon part of her to take over, as it is too chaotic. A mindless killer is not good company. And a normal girl would be tooboring and easy.

He prefers stealth over power, though he is more than what you would consider strong. He conceals it well. He loves cats, and they seem to like him too.