I'm pulling Morgan from FE Awakening some time after his paralogue. He's an amnesiac, just like his own mother, and struggles with piecing together certain memories that he is missing. He looks up to his mother a lot and wishes to be a tactician just like her one day. For this Morgan, his parents and Robin and Chrom which makes Lucina is older sister.
He is going to be using elemental magic. For a familiar, he would probably have a jackalope or a peryton.
Genya Shinazugawa
Kimetsu no Yaiba
Enable me, please!
The angry boy himself, Genya. He is able to temporarily gain the attributes of whatever creature he bites into. I'd be pulling Genya post-Hantengu fight where he isn't as short tempered as before and is more likely to team up with others. He is still new at making friends and still struggles with talking to girls. He is insecure about his strength so he is willing to throw himself into danger even if it leaves him maimed.
For magic, Genya will definitely have animal magic. I'm unsure about the familiar but I'm sure it will be something bird-like or something that flies.
lord i am indecisive