List of standard-sized Avatar action figures in the main toyline: (not counting battle benders and such)
Aang
Aang with a blue whirlpool arm (released twice)
Aang, clear blue
Aang, clear blue with white arrow
Aang, solid blue with clear arrow
Aang, normal colors with clear arrow
Aang in water tribe outfit
Aang after Jet beat him up
Zuko
Zuko in the outfit he wore while sneaking into the ice city
Zuko, scraped up after the ship exploded
Blue Spirit (Zuko)
Sokka
Sokka with war paint
Roku
Roku, clear blue
Zhao
Jet
Random Fire Nation Soldier
Bumi
If I were a kid, I'd just LOVE that selection.