Nine-Toes

Nine Toes is the first of many bandit lords, as well as the first boss the character will battle in the game. Although he is a boss, he's usually not much of a challenge.

Background
Even Nine-Toes doesn't know how he lost his toe. He suspects that Bone Head took it to use in his voodoo ceremonies. (From the official Borderlands guide)

Nine-Toes is an insane bandit lord who resides in Skag Gully. He commands some of the Bandits in the Arid Badlands and has two pet skag that he uses to guard his lair. The lair itself is set up in a cave system, close enough to stage frequent raids on Fyrestone. Reportedly, Nine-Toes is also in competition with Bone Head, a rival bandit.

It is suspected that Nine-Toes based his camp in Skag Gully in response to a challenge issued by Sledge, seen in the mission Why Are They Here? Possibly to try and compete with Bone Head.

Involvement
Players spend a large portion of the early game building up to Nine-Toes, including eliminating a small encampment of bandits just outside of Fyrestone. Once they are taken care of, the next objective is to enter Skag Gully and kill Nine-Toes himself. He is holed up in a cave hideout, with several bandits guarding him. Once these are dispatched Nine-Toes and his two skags will be found in a small arena at the back of the cave.

Guaranteed Drops

 * The Clipper

Quotes
He says all the quotes of a normal psycho, but in a much more calm voice. There are also some lines that are unique to him:
 * "You woke the wrong dog! Aww YEAH!" (Accompanied with a pelvic thrust)
 * "I'll rip your arm off and beat your baby with it!" (Sometimes at the beginning of the battle.)
 * Oh god! Oh god!! (When on low health)
 * Get away! (When on low health)
 * Somebody help!! (When on low health)

Mad Moxxi's Underdome Riot

 * "You remind me of my mother... I ate my mother."

Trivia

 * A pre-release promotional video (and his in-game cutscene intro) introduces Nine-Toes with the tag line, "Also, he has 3 balls".
 * Judging by his quotes, outfit, and behavior, Nine-Toes is some sort of psycho that hasn't completely lost his sanity.
 * It is presumed that Nine-Toes lost one of his toes by accidentally dropping The Clipper on it, which is implied in the gun's description saying: "Don't drop it, might lose a toe".
 * The pet skags fight with Nine-Toes feature the names "Pinky", and "Digit", furthering the theme of toes used with this character.
 * "Toe Cutter" was the name for the leader of the biker gang in the movie Mad Max and the Nine-Toes is very likely a reference to him.
 * The quote, "You remind me of my mother... I ate my mother." appears to be based from The Dark Knight. While trying to find Harvey Dent at Bruce Wayne's fund-raiser, the Joker remarks about an old man at the party, saying, "You remind me of my father... I HATE my father."
 * Nine-Toes will preform a crotch chop when he is encountered.