Blue

I do not unfortunately 😔. You could probably find out some information about him that I've written throughout his tag, but it's not all in one place so you might need to look for a bit. That being said I can give you a rundown of his backstory since none of the other players in the campaign are on Tumblr so I don't need to worry about spoilers.

Furnier's 30-ish years old, he joined the Hellriders at 24 (which is pretty late to join) and is at the rank of a Hoof, which is the lowest rank. At 10 years old he was captured in a village raid by the cult of Zariel, most of the people were killed but a few children were taken in and indoctrinated as cultists, which he was, and when he was a bit older he became one of Zariel's warlocks, given a specific task to carry out as part of his pact contract which involves infiltrating the Hellriders. Furnier is very much still a cultist but obviously hides this, and he's managed so far, but he's waiting for the right moment to fulfill his part of the contract with Zariel as he'll be rewarded once he does.

After he was taken in at 10, he was mostly raised by an elderly Yuan Ti woman called Goltha—she was the first person like him he'd ever met, but she was strict as hell. Yuan Ti view emotions as weaknesses and flaws, so whilst Furnier already had a limited capacity for emotion as it was due to his species' brain makeup, Goltha also beat him whenever he expressed any emotions, which is largely why he is the way he is now. He has mixed opinions about her, on one hand he resents her for how she beat and scared him as a child but also (in his mind) understands why it was necessary and is grateful for shaping him into what he is now. He was also completely illiterate before being taken in, so Goltha taught him how to read and write, not just in Common but also Infernal (due to the cult's connection to the Hells) as well as Abyssal and Draconic (which is the languages Yuan Ti use).

Furnier's a Yuan Ti Pureblood, essentially a demonic snake-human hybrid, and as a child his features were very prominent (scales up his limbs, yellow slitted eyes, forked tongue, all his teeth are fangs, he has snake genitalia etc.) which caused him to become ostricised and abused for his appearance in the religious place he grew up in. As an orphan from a young age this wasn't great and it got to the point that when he was about maybe 6-ish–7 years old he ran away from the orphanage and became homeless, which is how he ended up in the village that got raided and he stayed there for a good three years before it happened. As he got older his features waned a bit which allowed him to pass mostly as a human, but as part of the cult he was given an amulet that would not only hide Zariel's infernal power that lingers on him from other people but also disguises some of his snake features (mainly eyes), so now he can trick people into thinking he's human so long as he doesn't do anything to make them think otherwise (like unhinging his jaw, y'know the usual).

Before becoming a Hellrider Furnier worked as a bar-hand from 15–20, and from 18–24 he was an executioner—the latter was partly due to his cult affiliations as they have many members infiltrating positions of power within the city, and as an executioner he would get rid of people they deemed a threat, but his position as an executioner also meant that he could eat the bodies of dead criminals that nobody would miss (Yuan Ti are cannibals and Furnier can only really eat meat so you can see how that would go).