(1) in pb3, we can make our custom skin (even u can draw your own) and it will be cool if u can animate your character or upload anim.FBX files or something idk
(2) i think u can attach some sort of cape or tale on your playermodel but in addition, i would also like to discuss another idea like adding new limbs to the character, you know, the character limbs such as (head, body & hitbox, arm & hands, thigh & legs & feet) it will be cool to add more limbs and join them. or even making them breakable, or just leave the option keep it as static.