The third dragon: Sivello Glasch!

Sivello is a photokinetic, self-made billionaire with assets everywhere and a voracious appetite of adventure to always collect more. Due to his sheer affluence, he's a jerk to (almost) everyone beneath him literally and figuratively.

Sivello is the kind of guy who has whatever you have but bigger and better. Bigger wealth, bigger body, bigger feet, bigger ego, bigger EVERYTHING. Sivello also doesn't need bodyguards despite his status. Photokinesis is just a broken power to have outright. Trying to attack the guy who can bend all visible light into a weapon and turn invisible is a bad idea. Not to mention his sheer size compared to everyone else. Functionally, he and Serrill are the same height until you get to their neck where Sivello has him beat. So yeah, good luck taking a swing at the large dragon with a tail that could put you on a skewer on top of blinding you.

He has a bit of a blooming situationship with Serrill. Referring to him as "my champion" often. Serrill is also not affected by photokinesis as his crystal horns reflect the light back. So already this intrigues the man who perceives himself as untouchable. But it also gives him good optics in case people question any of his morally dubious actions. "Don't worry guys, I do good things occasionally with this local legend by my side."
To top it all off, having Serrill's stingy ass as a business partner is great!
The two of them are meant to represent Greed/Gluttony but really, only Sivello embodies his trait of gluttony.

His wings are stained glass and those can also be found on Bsky.

As for Sivello's type, he embodies the Fairy type.