Why always Yuffie? that is enough! In origin in KH there was Rikku and not Yuffie...
but then she was substituted with a sad character of FF7 (sorry, all Yuffie's fan,
but this is a my personal opinion).
Rikku is beautiful, is rich of life...is an explosive girl...
While Yuffie is only cute, and materia hunter... she is a marginal character in FF7...
I wanted in KH 1 Rikku and not Yuffie. So I thought to make Rikku KH costume and not only that of Yuffie.