The key part here being a character
I made, and not one made by someone else and then thrown in my lap when they bounced from an RP to see what I could do with that character (it's a lot).
Based on how often I've tried bringing them back, probably the OG Chartose.
Drunken and disorderly half-elf mercenary with a crossbow, lance, and a
very clever girl horse. Also present was a dwarf, who he was racist against, and a giant, who also disliked him, and a fire-elemental whom he was smitten by (and also happened to be a princess in exile operating incognito)...
who also hated him.
-He's been re-imagined/re-booted/re-interpreted more than a dozen times by now, even changed species a couple of times along the way as the harbinger of well-intentioned chaos.
One of the favorite one-hit-wonders was
a water-merchant I made for a fallout RP. Befriended a lone-surviving tribal and set out on a quest to free them. Ended up breaking up a brothel, recruiting an NCR ranger, made a pet nightstalker, and encountered some slavers in a tank. Originally I'd planned for him to get mortally wounded by the end of the RP, but everyone else made a very strong case that he should live happily ever after. Oh, and
I never even played fallout before (still haven't), so I was just making things up as I went and had a page open to the wiki for any fan/canon info as needed. Washed that all down with a brahmin-burger with cheese and a tall glass of sunset sasparilla.
After that it's a tie between Ira Strank, Adrian Vance, Alexi Sheppard, and Specialist First class Schwartz....
Think Delta-Green meets Red vs Blue. Honorable Mention for Agent Stratton for making the most unsettling backseater in a police-cruiser when doped-up on painkillers.
-They had to make a skippy's list...
for each individual member...--BTW, that's where the signature came from.
See, [Foster] cared not if the mission succeeded or not, as long as it was spectacular trainwreck. Sometimes that was the host Nation firing a SCUD into a hospital to destroy a foreign infection and accidentally sparking a rebellion... or accidentally starting the Mokan Drug War.
Although those incidents are tame compared to the Task Force Atlas chronicles... doing everything from HALO insertion in the eye of a hurricane upon an erupting volcano to defuse a doomsday-weapon, to... that thing with the airship... and a mecha that thinks it's a cow.
Oh, and supersonic LAPES because SPEEEEEEEEEEEEEEEEEED
*The BPL is a separate entity, but we pretty much both wrecked a pair of perfectly good airships for funsies.
Others would've been "that time Adrian was a werewolf", a couple of mech pilots, dragon-hunters, some shenanigans in space, and a pointy-eared fae blacksmith that was deathly allergic to iron.