They are two vampire twins, a girl, Alice and a boy, Felix.
They both look similar with only two differences, their gender and a little height difference between both of them, Alice is shorter than Felix. They both have white hair and red eyes, pointed ears, pale skin and two vampire fangs.
Alice has her white hair tied in a ponytail and has piercings on her ears, one on her tongue and one on her bellybutton.
Felix has short white hair and a crucifix earring in one of his ears.
They fight a lot.