Rainbow

Rainbow is the other best friend of Maddy.

Appearance
Rainbow is young-aged. She has tan skin, freckles, green eyes and light brown curly hair with multicolored streaks.

Background
She FLOATS when Saffron calls her an airhead in response to being called shallow.

Floating clouds is her alias in episode 1.

"I want my friend back" is how she signs in Breaking Up is Hard 2 Do, referencing Saffron.

She literally floats in the show's opening and also first episode. She might be psychic and can do a telekinetic levitate.

Rainbow seems to have a lot of upper body strength as she is able to hold up Maddy in Love Potion, although perhaps she is using telekinetic assistance.