I formerly had the idea, that Dr. Wily made three red demons and that only one contained flanny in it. Now I'm thinking of a possibility, that all three of them had another slime creature contained inside them. Each one similar like flanny, but different on their own way. As flanny found her new owner from the very beginning, were the other two on different locations, but they found flanny in the end somehow. Of course they're more aggressive at the beginning, but their true nature came back with time.
Mousse would be in orange color and was the first one to find flanny. The first glance of her was of a rowdy, but she was more of a spoiled princess that that started a liking to sing.
Coulis would be in purple color and the last one finding Flanny and Mousse. The first glance of her was of a temptress, but it'll be soon found out, that she's very shy around guys, but still very caring for the others.

oh god, why am I writing too much, when I have some new ideas?