Theodore Remus Lupin
1.) He can't stand to be in the moonlight. He's not a werewolf, but it makes his skin itch and his temper run high and he doesn't feel like himself on full-moon nights. For years, he used to ostracize himself from family gatherings because he didn't want to do something stupid and hurtful to the people he cared about. Victoire is the one who convinced him that he wasn't alone, and he thinks that is the first time that he realized he loved her.
2.) When Teddy's fifteen, he discovers an old and battered copy of On the Road hidden in one of his mother's old Transfiguration textbooks. Immediately afterwards, Jack Kerouac becomes his favorite author.
3.) Becoming a psychiatrist wasn't his first career choice. He wanted to be a MediWizard, but after seeing how many people were misdiagnosed at Saint Mungo's – witches and wizards who suffered bi-polar disorder and schizophrenia taking potions and undergoing painful charms and spells, only to have the symptoms return within the month – he knew he had to do something. He became the first person to combine Wizard and Muggle means of therapy and medication, something that later became known as the Lupin Method of Diagnosis.
4.) He starts calling his grandmother "Gran-dromeda" because he isn't sure what to call her – she's his grandmother, but she raised him like a son. In the end, he calls her that because it makes her smile.
5.) He doesn't care that Jamie, Al, and Lily aren't his real siblings, or that Harry and Ginny aren't his real parents. He loves them, and they love him, and that's all that really matters.
6.) When he names his first and only son Peter Harry Lupin, he knows why his godfather flinched at the name. He doesn't care. Peter Pettigrew had some good in him, was a close friend of his father's for years before he turned over to the dark side, and Teddy still doesn't think that it was fair that all the other Marauders had children named after them and Peter didn't.
7.) He thinks Victoire has weird taste in music, but he knows better than to tell her that to her face.
8.) Raw meat, moonlight, Uncle Ron's driving, and books by Dean Koontz are the only things that make him physically ill.
9.) He likes Asteria and Scorpius, and has a grudging respect for both Narcissa and Draco. But the one time he met Lucius Malfoy, he wanted to beat him to death with his stupid snake-cane.
10.) Aside from the turquoise hair, he usually keeps the rest of his features the way they are supposed to be, and he gets offended if someone asks him to "morph" on command.
The one time he didn't was when Uncle George took him for a drink on his seventeenth birthday, and solemnly asked him if he could take the shape of his long-dead Uncle Fred. Teddy did so because he loved his uncle, and would rather be locked in a box full of venomous spiders than admit to another living soul that he held his uncle when he cried.