My interpretations of SU characters, having never seen the show.

Steven: Friendly. Half-rock. Likes ice cream? Probably a pacifist.

Glasses girl: Steven’s friend. Strict parents???

Afrorock: Gay. A mum. Huge. Very deadpan. Probably good at hitting things.

Pearl: Really gay. Another mum. Fussy. In love with Steven’s mum? Has a sword. Probably part birb. Not actually Utena.

Purplerock: Short. Changes shape. Likes food. Is not a crocodile or cloud. Probably a troublemaker. Not a mum.

Peridot: Jerk. Smart. Likes the word clods. Looks like a dorito. Has a spaceship. Is pronounced peri-dot.

Bluedressrock: Might be a witch? Likes Steven. Has something to do with water. Gone???

Orangerock: Big. Huge jerk. Something about rock jail? Doesn’t float very well. Really huge jerk.

Mumrock: Steven’s mum. Dead. Really tall. Leader of the good rocks.

Steven’s dad: Steven’s dad. Friendly. Vest. Pearl doesn’t like him, I think?

Lion: Is a lion. Pink. Might be a rock. Hyperdimensional mane with a sword in it. Also likes ice cream?

EDIT: I have since been informed that Pearl, is, in fact, Utena.