Who is the character you play in the new kingdom hearts game

depends on which one here is a list of all the ones i know

1.kingdom hearts-15 year old sora

2.kingdom hearts chain of memories-15 year old sora or 16 year old riku.

3.kingdom hearts 2- 16 year old sora

4.kh 358/2-story mode:roxas mission mode: organization 13,riku,mickey,sora,donald,goofy

5.kh birth by sleep- 3 story modes of ventus,aqua,terra

hope that helps!!!