Umbrie
Adorable Little Nymph
That actually sounds really cool! A lot of my favorite characters i've played are under 15, actually. I think that younger characters have a lot of potential, but it needs to be used carefully.
a younger warrior is generally quicker and likely has more stamina due to their youth. but doesn't yet have the strength to wear heavier armor. but they can be pretty quick in a silk gambeson with a shield and shortsword or shield and spear. they might not get much out of a longbow with their strength and size, but can get plenty of benefit from a shortbow, especially a mongolian shortbow.