I've checked the Minor Characters forum three times, and I can't find a thread about Theodore. I was quite surprised he doesn't have one actually. But he has a part in my story, and I can only find brief descriptions of him on the lexicon and wikipedia...
Who do you think he might have been friends with? Malfoy and his friends discuss him briefly in HBP, but he doesn't seem to be in with them.
He can see Thestrals. Who do you imagine he saw die? How would that effect him?
What do you think his Patronus could be? Boggart?
What do you think his childhood was like? His dad's a Death Eater, do you think this ever had any influence on him?