1) Driver or Rider?
Walker.
2)Red or Green?
Red.
3) Pirate or Philanthropist?
I am assuming this question is asking which I prefer as a human overall, and because pirates are quite dirty-in both character and physicality-I choose the latter.
4) Gravy or butter?
Neither.
5) Cat or dog?
Both if it's raining hard enough.
6) Iron or wisps?
Wisps-that is, if you are referring to those puckish ghost-lights.
7) Cowboys or Astronauts?
Astronaut. It's about time The Village People added a new character.
8)Numbers or Letters?
Numbers.
9)Betty Boop or The Librarian?
The Librarian if you are referring to the painting by Arcimboldo; Betty Boop if it is something from some sort of pop-culture what-have-you.
10) Fresh or Salt Water?
Brackish water.