A traitor to the oppressive empire the players are fighting against, giving them key information about strategies and key weaknesses. Joins the party for one super-important mission, but is too awesome to keep, except maybe in the postgame as a special recruit.

Final Boss! Too Smexy to be anything other

You're that one dreary drifter the hero's team picks up about halfway through the game. You cast extremely high-level dark magicks and tend to make half-hearted death threats to anyone in the party whom invades your personal space. Just before the final dungeon, the team discovers that you're actually some sort of divine being and that, while you were originally unleashed upon the world to destroy it, being with the hero and his posse for so long has made you want to save the world instead!

An Artificial Intelligence that was driven insane by a computer virus and now want to take over the world, but it's up to a team of hackers to go into the internet and cyberspace to defeat you, learning an important lesson about love and teamwork along the way.

The mad scientist o3o

The super-hacker whom the party rescues early in the game and needs later on to infiltrate the Big Bad's not-so-secret lair

Joins party for a character specific plot line, then leaves the party, leaveing the main character with a magical item as payment.

In futuristic fantasy setting video game, a punker ish girl who happens to have some magical powers and is whisked away on adventure when her friends get in trouble.

Scurvy pirate who captures the main party, and acts as a boss, before having her crew destroyed by the big bad, and joins the party using long ranged weapons and a roulette based special attack.

The slightly crazy but very cute bomb expert for the team :3

Fancy character met at a party who defeats the boss at his own game.

The strange tanker character who joins your party halfway through the game.

a secret ninja that arrives at just the right moment to deal with an enemy that the party cannot deal with yet, and then vanishes afterwords.

The party tinkerer that specializes in personally tweeked ranged artillery. :D

The evil mastermind that tricks everyone to think that she's on the good side whilst she's actually plotting to kill them all.

A evil fisherman who comes and attacks you out of the blue for touching his fishies.