Hm... 3.X D&D, Living Greyhawk Campaign
Alokar Moraile, TN Elven Wizard
Now, elven wizards have a notoriety for being arrogant. However, I managed to confound folks by turning the majority of that arrogance in an unusual direction--towards other elves. The campaign made it easy. A very common trope in Living D&D campaigns is the, "Elves buried an ancient evil on this site generations ago, now the humans have dug it up." This was usually done with a fairly heavy-handed environmentalist theme, though not always. In any case, Alokar's inevitable reaction was, "Of course they dug it up. They're shorts [ie, short-lived races]. They weren't even on this part of the continent when this thing was sealed away. Now, what's the local clan's excuse for not putting up a #$*&^ warning sign and keeping it updated whenever a new language was invented? There's hundreds of elves here (thousands, in many parts of Greyhawk)--couldn't you spare one or two to stand around saying, 'Move along, ancient evil undead demon thing sealed in the ground, move along, please'? You could have probably used it as a punishment assignment for troublesome adolescents! But no, you had to go and seal yourselves in your towers and your treehouses, and now we're ankle-deep in Illithid $#!^!"
Eventually, Alokar became an Alienist, and thus became a Pseudonatural creature-type. After that, his tagline became, "I used to be an elf. Then I got better."
Of course, by that time, he also had a lower Diplomacy score than anyone else in the game. (Being an Alienist gave you a -10 Diplomacy penalty. Coupled with a natural 8 Charisma and an in-game Curse for trying to keep the treasure of a god who hadn't seen fit to curse the orcs who had originally killed the priests that had the loot originally, that left him with a -12 Diplomacy score!)
By the end of the campaign, he'd taken to wearing a Ring of Invisibility, and stuck almost exclusively to casting Summon Monster spells, frequently Silent Spelled with a Rod. So the party often was, in-character, unaware that he was actually there until the pseudonatural Dire Badgers started popping up out of nowhere to kill the villains. Had the campaign not had a hard level-cap of 16, he would have also taken Persistent Spell (I think that was the Feat--let you burn a spell slot permanently to be able to cast at-will a spell of 8 levels lower) at 18th level, allowing him to cast Unseen Servant at will, as many times as he liked--just to be able to completely mess with everyone around whenever he was sitting (invisibly) in a pub or other public area.