The whole idea will sound a lot like Tsubasa Cronicles but i've never actually watched that anime so it's pretty much a sort of knock off of that storyline.
Plot little girl is losing her memories somehow she's important to the emperor of that world. Her brother is trying to help her regain only her important memories and try to keep her away from the emperor and his legions. Yeah not the greatest idea but it can totally go somewhere.
So I'm going to have 2 chars The girl and her bro unless someone wants the bro and other people coulld be the emperor a comander a freind a talking animal it doesn't really matter.
Name: Andrinia
Age:7 eye color: blue hair color: blonde
(the rest can only be doesn't remember)