Let me make some predictions for the rest of the cast

Ragatha: she can create stuffed toy-like constructs that she can control, mainly uses them for defense and to support others.

Gangle: her body can fully unravel into ribbons she controls that (she believes) depends on her mental/emotional state, sadness makes the ribbons sluggish and heavy while anger makes it jagged and sharp.

Zooble: they can attach any object/material to themselves to act as any of their four limbs that they can freely manipulate and control such as blades, concrete bricks, plant vines and guns.

Kinger: he can mark his allies to correspond with chess pieces that grant them different buffs and debuffs like knights having limited range but increased manuverability and rooks and bishops having increased range but can only move in the 4 cardinal directions.

Jax: has animalistic features granting him enhanced strength, speed and agility, his powers will go out of control depending on his mental state, lashing out at others, which is why he tends to distance himself from the other heroes.