I feel that character designs are pretty terrible, especially in the face department. I think overhaul down the road would be great.
That being said we have Japanese voice. I think it's great that they added another language and would love to see other foreign languages such as French, Spanish, German, Korean, Chinese, Middle Eastern, etc. If we want to be really crazy we can add aliens such as Martians, Lunarians, etc with made up alien voiceovers.
Costumes in relation to different cultural backgrounds would be fun too. Ninjas are probably one of the first things that come up in the minds of many player base. It would be funny to see ninjas running around running the ship and fixing stuff.