It's the last movie, and we have tons of HP fans, so why not. Answer each of the categories for your character ICly if they were somehow in the HP-verse instead of our own crazy String Theory world.
Character:
Wand: wood/core/flexibilty/length
Patronus:animal, why
Boggart:what, why/what would you turn it into to make it funny?
House:which, why
For Wand stuff, it's googleable, but here are a couple of links to help you out:
http://www.hp-lexicon.org/magic/wands.html
http://www.beyondhogwarts.com/harry-potter/articles/wand-basics-101.html
http://harrypotter.wikia.com/wiki/Wand_wood
http://harrypotter.wikia.com/wiki/Wand_core