Preston is an Undead Bard who describes himself as the “Bard Of The Seas.” This means he has a sailor background. He was initially encountered in the campaign at the Graveyard Camp where he's been hanging out for a long unknown amount of time.1) According to Preston his sailor friends bet him that he could not “seduce a dragon.” He came up to the top of the mountains to prove them wrong as part of that bet, did in fact manage to “seduce” a wyvern2), and got burned to a crisp as part of it.
Preston died because a wyvern shall we say, “shagged him to death.” The tale of how he became an Undead after that however is unknown at this time.
The status of being a “Fuck Boi”4) is entirely the fault of the actual players in our campaign. As soon as I, the DM, who was improvising details suggested the stereotype that a Bard was trying to seduce a dragon, “Fuck Boi” was thrown into conversation at the game table. Apparently one player had multiple ex boyfriends named “Preston” who were total man whores or something and since I told everyone that they had to name this new NPC. Preston stuck, and now this campaign has an undead by that name.
With Eyrun's quest to become an adult by visiting the Cloud Giant Shrine and her getting the rest of The Party to follow her up the Cloudfire Mountains also trying to find Eyrun's half sister Phoebe, it was inevitable that they'd rest at the Graveyard Camp and Preston would introduce himself, asking for help getting back down the mountain. This makes Preston a perfect pre-planned catalyst for important events and backstories of the campaign.5)
When Preston gets transported via the Disorienting Scrunchie he ends up inside the special room of the Mirror House in Goldvale. This is in fact what Eyrun's dream foretold. This puts him in immediate contact with a Kuo-toa Idol & statue which do something special to him. They don't bring him back from being undead but they do seem to restore him to seemingly having living flesh, making him an almost passable living looking “human”. He quickly learns the town, takes over ownership of the Mirror House since the last owners went missing a couple months before his arrival8), and with his ongoing “healed” state 3 more Kuo-Toa statues quickly are formed in the special room. His attitude toward this is accepting since he is from the very same Tropeical Sea that the idol originates from and somehow this is alright by him, although is not likely to be viewed with open arms by others.