I have sacrificed many PCs on the altar of unstable campaigns- it happens. Some favorites culled from my 6" thick file of old PCs:
Chain Lightning - a rollerblading, weighted-chain wielding, female punk-nümetal mutant- with electricity powers.
Hazard- a silver skinned alien female chauvinist ex-gladiator turned superhero (powerhouse type) who had to eat her body-weight in food...daily. (Champions/HERO)
Pax - a PAG (power armor goon) whose armor and weapons were generally average, but his REAL schtick was overriding/hacking AI's, Robots, and, of course, other PAGs. Campaign died (Champions/HERO).
Major Mosquito - a private eye who becomes a vampire and goes insane...and thinks that his vampiric abilities make him a superhero a la The Tick. (GURPS: Vampire playtest)
Rubik Guildenstein - Gnome Illusionist/Thief artificer/alchemist who was wicked with his darts and firebombs (2Ed D&D)
Angel Zero - a Ley Line Walker who believed her powers stemmed from her virginity. (RIFTS)
Osibisa - an African-themed Ranger armed with an assegai - amusing in that he couldn't hit his favored enemy to save his life. DM ended the campaign to be a player elsewhere. (2Ed D&D)
Arion Dragomir - a rarity: 3 time loser. A cleric based on Finnish mythology using the 2Ed Player's Option rules. A fellow player whined about Arion's ability to wear Medium armor, use fighter weapons, cast Abjuration (wizard) spells, and had more Major and Minor spheres than his cleric- not realizing that Arion had NO offensive spells other than Bull's Strength. To keep peace, (commercial) Character Sheet was torn up in whiner's face. Arion was ressurected in another campaign featuring 2 gamers from the other game group...where he was critted and killed by 1 shot from a 2-Hd sword. The PC was revived from notes once more for 3Ed, only to see the campaign fizzle before a single die was rolled. (2Ed & 3Ed D&D)
Johnny Bones - old-school NE Ftr/Th replacement PC for Arion Dragomir's first incarnation (see above), and created in spite- the plan was to assassinate the whiny player's PC. However, the campaign died when the whiny player's PC got exiled from the country in which the campaign was based, and he complained so much the DM hasn't gamed (RPG's at least) with us since. (2Ed D&D)