Ooooh this is a hard one. Momiji is hyper cute, whereas Kisa is sweet cute. I think I'd take Kisa as a sister, and Momiji as a friend. Momiji is adorable, but I think his hyperactivity would tire me out after awhile.
Momiji is so cute! i Amore how he is accualy 16. but Kisa is so sweet, she's 12, ugh, i'm gunna hv to say Kisa, i can;t help but Amore it when she says "Hiro-chan" oh, so kawaii!!!
um i whould say Momiji is in both rabbit form and humen form and kisa is cut in both of her forms too but. i like momijis life story better even if it is sad. so i will go with momiji:))