)THE HE4RT FANTASTIC(
Call him He4rt, Jupiter, Meteore, Harold, you'll refer to the same deity! He was formed out of Heart's failed attempt at trying to be like Mind; strong, brave, fast, calculating. Juno wanted to be just like that, but he failed and that broke him to the point that he couldn't )and still can't( look at any mirror and look at his own relfection because he didn't like it. All of that shame, self-hatred and sadness lead He4rt to be formed.
See those squares below the dress? Those are there to impulse the similarity within he and Mind, it's basically there to feel closer to Mind in some way. Harold spends most of his time making fun of Heart for failing and for anything he does. Instead of being kind, he's basically just an asshole with everyone (kinda) and despite being in Jupiter, he can use mirrors to teleport or just manifest himself.
Jupiter is divided in two sides, the stair side (full of endless stairs, sometimes dark) and the tower side (circular towers that get taller or smaller randomly). We could say it's abstract? Not at all.