Tails the fox in a more grown up way. My base idea was that he had no easy childhood on Moebius and has become used to fighting and urban survival situations. What impact a life as this would have on a young decent mind such as Tails'. He could try to forget about all this and bury himself in machines ... or he might develope sarcasm and inner strength.

It's just my take on a this character, hope you're not too annoyed.