Why do you like Theodore? Because he's not another two-dimensional Slytherin stock character. Because he's cleverer than Malfoy. Because he's a cute little loner. :B
What do you think his role will be in the next books? Frankly (and unfortunately) I doubt much at all.
Who can you see him dating? No one canon at the moment.
What are his parents like? Well his mother's dead. His father's a domineering Death Eater, but Theodore is strong-minded enough to have his own opinions on life.
Which celebrity represents what you think Theodore looks like? Conor Oberst like woah.
Would Theodore want to be called Ted, Teddy or Theo? Theo by a select few.