Obviously, I'd wanna be any type I could. However, when I have to narrow it down it would probably come to Fire/Normal or Fire/Flying. For me, the power to control fire is seriously awesome. I'd gain a ton of respect for it, and I've always imagined what it would be like to have fire bursting from my hands.
In terms of the normal half, I wouldn't want to be purely a fire type. I think it would be more cool to be partly fire and partly human (I assume that's what normal would be) so that I wouldn't be a freak or something... Referencing Percy Jackson, would you rather be Poseidon or Percy? I would choose Percy, but that's my preference.
And flying... It would be a dream come true to fly. That would be amazing. (That and invisibility, but I suppose I'd need to be a ghost for that!)