So, I’ve been working for a while on conceptualising the rest of Mellow’s team, since he was pirate captain without any semblance of a crew beforehand lmao
This is what I came up with:

Lumi Galvern is 5th member of the team, and holds within her an electrifying power. She’s about as energetic as one can get with abilities like hers, though she sometimes forgets to take it easy at times. Lumi fights with electrified whips that crack with the sound of thunder.
Tomoe Suzukaze is the 3rd member, a tough gal who’s isn’t as strong as she looks, because she’s far stronger. She holds within her the power of the wind, but you’ll find that her personality isn’t as rough as first impressions may give off. She fights with weaponised fans and a prosthetic arm to make her battles a breeze.
Zale Estuarna is the 4th member of the team, who holds within him the power of all forms of water. He’s an eccentric scientist who’s easygoing attitude can change on the fly like water itself. Zale fights with a hammer equaling himself in strength to erode away enemies.