Amumu VU :^|
mummified 8 year old - Google Search
So in short, annie
tends to look very much like a girl but maybe in time could be touched up a hair for better side by side comparisons with other champs that look a bit more realistic for their age.
The main part I speak of is the size of amumu
's feet and head.. Perhaps something a touch more realistic to give him a overall tormented soul kind of look, and have it still resemble a little boy ;) his back could be modeled so he just sits down, whimpers and sobs until he makes it back to base.