1. Do you play Good, Neutral or Evil?

Typically Good, at least on a first playthrough.

2. Do base him/her on yourself/a character from a film or book/someone you made up/don't put that much thought into it?

I have a character I have written for sometime who I play as in games where you have a lot to do with character creation.

3. As you play do you think "how would my character handle this?" or do you act first think later?

I know the aforementioned character well enough that it rarely takes much work.

4. Do you think of a little backstory for them?

typically, yeah. How he ended up in that world, etc.

5. Mage/Rogue/Priest/Warrior?

Warrior.