What if they added a quest where the WoL was turned into a child via some random magical mishap....(google Detective Conan)
basically they're only physically a kid, but that way dialogue and crap wouldn't have to be toned down for them.

Personally I think a side quest for it would be hilarious considering SE's story telling

-edit

Also what they gave you an option to stay a kid or grow back up. And after a year you could choose to revert back if you so choose, and so on and so on...