Well blue is a special case. She has disrupted too many things on earth..she now has to stay on the clouds. yellow has put her up there for the protection of everyone else. She is able to turn into any sea animal. so every once in a while she causes mass panic in the human world by Turing into a giant kracken. She is big sister to indigo(who is scared to death of her) and little sister to purple(they don't talk a lot) She is able to see spirits and calm people down.(not like she uses that power very often)