I'd like to be able to play a kid character

[Felis]

I think FFXIV did a great job of representing young characters. Think of the Conjurer story quest for example: they look like real kids, no adult features that are common in anime kids.

In the Conjurer story is only 1 kid. The guildmaster is a grandpa who just look like a kid (Padjals and their white hair)

Their age shows in some ways, such as grayed hair or dull skin tones, but they retain their youthful shape until death.

http://finalfantasy.wikia.com/wiki/Padjal