Professor Mix

Prof. Mix is the daughter of Sarah Alin and Thorne Arashi. Her parents never thought of her normal, reason one was when she started to talk to herself, second was when she would be angry her eyes glowed a brightly blue, third she never got out and when she did she went alone to the forest just to practice magic and fusion. When her parents found out though she was banished and shamed for it.
Childhood
At the age of six she started to she started to experience many things. She fused with a bird, and started to fly to the sky. Every day she would go and try to fuse with something else. When she turned 8 she practiced other magic but was scolded from it, after a couple more years she finally found something else she could do. Hitting 12 she started to venture out more and fuse with something that could fly. She heard about Hogwarts and so she decided to check it out. She flew about landing in the forbiddon forests she would keep walking and wonder about. Bit it ended on her sweet 16, she wanted to show her parents what she could do. When she did they scolded, yelled even broke a few of her things kicking her out. The people of her town banished her.
Adulthood
As an adult...she caused more mischief then the average teen. Causing pranks, troubles and all kinds of mini wars. But when she was captured after pranking a death eater, unknowing to her of course, she was tortured her voice being taken from her along with a part of her emotions. She got whipped, burnt, and even electrocuted. But nothing hurt like the magic they used against her. She practically started to loose her marbles after so long. Being chained and starved she finally broke free, fused with a deatheater to escape. When she infused she had a new type of will, a new way to live. She attacked the deatheater even killing the deatheater who tortured her, wreaked her life and took away what she needed.
After two years
Mix was found, by Dumbledore, and recruited to be a professor for her Fusion and Anatomy . When arriving it was after a war she heard about. The war against Argon's Army. She mainly kept quiet and maybe always was the one to still the snacks from the lounge. She would take students out to the forest and teach them about fusion. Thought they tend to ask about her Mark's she was born with. She would simply change the subject if pushed on she would use magic to get back to the academy and leave the room. 
That's simply a small summary