Matteo
An exquisitely mannered Pink who has the job of teaching a Helldiver to pass for a Gold, from the correct fork to the proper way to despise someone.
Matteo has seen the absolute worst of the upper Colors from extremely close up. It's his lessons, more than the surgeon's knife, that make Darrow able to walk through Society.
He is revealed to be the husband of Quicksilver. He finds the wounded Lyria and brings her in, and he takes a part in the hidden project at the centre of the Silver's fortune.