Tails is, quite frankly, useless. He stays behind all of the time, and is pretty much a liability whenever he gets involved. Sonic befriends him because he believes spending time with him will get him out of going on missions. However, and he would never admit this to anyone, including himself, he feels some genuine affection for him after a while.

(Tails is obviously a male character. I'd like either a male who can pull off a convincing little boy voice, or a female voice actor)