Xander LaVelle Harris was a geek. But he wore his clothes in rebellion: so what? His best friend is Willow Roseburg who is his 'guy for knowing about girls stuff.'
In season one Buffy the vampire slayer moved to Sunnydale and changed his and Willow's lives. They became the 'slayerettes' or 'scooby gang' who helps Buffy with her slaying and research. He has saved her life especially when she was dead he revived her with CPR. Angel couldn't help her then 'I have no breath.'
Xander developed a crush on Buffy the moment she moved to Sunnydale but she rebuked him and fell for mystery guy, Angel. He is still friends with Buffy though, 'I'm used to rejection.' Buffy also didn't want to hurt Willow's feelings, as she has been in love with Xander unbeknownst to him ever since he stole her barbie when they were five.
In season 2 he started dating Cordelia, rich, beautiful, and admired by all (well, some.) Willow was astonished, '...it just means you'd rather be with someon e you hate than be with me.' It was a strange relationship as Xander had previously been treasurer of the 'I Hate Cordelia' club. He has a habit of inadvertantly saving lives, when Buffy drowned he revived her with CPR, and when Willow was in a coma, he woke her up by telling her that he loved her. When she woke she called for Oz, her boyfriend, she had finally moved on (or so she thought.)
In season 3 Cordelia broke up with Xander due to a kiss between Xander and Willow when they though they were going to die at the hands of Spike. Hearbroken, vengence demon Anya helps Cordelia and she wishes them into an alternate reality, where Xander and Willow are a leather-clad vamp couple, the master is alive, and the bronze is full of vamps. That reality ends, and everything is back to normal. Cordelia leaves with Angel to L.A. and Xander goes to the prom with now ex-vengance demon Anya.
Season 4, the scooby gang's changed. Oz, Cordelia and Angel have left, and Anya, Riley, and Spike (!) have joined. Anya wants a relationship with Xander, and he can't seem to get her out of his head, and they start dating.
Xander feels left out, with Buffy and Willow leading the big college life and he tries an number of jobs including a sex phone line worker, an ice cream man, a bartender (lovely fake ID card) and a carpenter.
Always willing to help with the slayage, Willow, Giles and Xander re-instate Buffy with their powers (through magic) so she can battle Adam. Willow is the spirit, Buffy is the hand, Giles is the brain, and Xander (always the joker) is the heart of the group.
Season 5, Xander is going steady with Anya. This season, there isn't much in store for Xander, he, along with the rest of the scoobies has false memories of Dawn, the key, and Buffy's fake sister.
There comes a demon, a little into the season that want to split the slayer into two different parts, slayer Buffy and Buffy Buffy. Instead, it splits Xander in two, seductive and confident Xander, and funny and joking Xander. Anya wanted to keep the two Xanders to have sex with them both, but the scoobies turn Xander back to normal.
Glory, a god, is after Dawn's blood, and Buffy will do anything to protect her. In the midst of the battle, Xander proposes to Anya. at first she freaks out, then accepts, but that is soon forgotten when Buffy sacrifices her life to save her sister and the world.
Everyone is having a hard time dealing with Buffy's death in season 6, especially Xander and Willow. Willow performs a spell to bring Buffy back from the dead because she didn't die a natural death. Xander isn't too keen, but he voted Willow boss of the group.
Buffy is back, and is having trouble ajusting. When Xander does a spell so they can fight the demon and everything will turn out good, the whole town bursts into song.
Xander and Anya sing about their feelings for each other and fears of marrige, and dance around their apartment. Just before the demon is defeated, Buffy sings about being pulled out of heaven by her friends. To top it all off, Giles leaves for England.
It's Xander and Anya's wedding. Everyone's there- Xander's family and Anya's demons. Also a creepy old man who says to Xander that he is Xander Harris from the future and warns him not to marry Anya. This feeds Xander's fear of marrige, and he bails on Anya. When it is discovered that the old man is a demon from Anya's vengence days, she want to carry on with the marrige. Xander says he can't, he can't risk the chance of commiting himself to her in case he isn't the right one for her. He leaves her at the altar, and Anya breaks up with him.
A trio of nerds from high school have decided to take over Sunnydale, and pose an annoying challenge to the slayer. She takes out two of them, but Warren is still out there. Warren shoots a gun, hits Buffy in the chest and kills Tara (Willow's girlfriend.)
Willow is mad. Very very mad. Turning back to the balck magicks she goes in revenge and kills Warren, then plans to destroy the world. She is not afraid to hurt her friends and takes out Buffy, Giles, Dawn, Anya and plans to destroy the world. She drains Giles of his magic, and prepares her chanting. Suddenly Xander's buy her, saying he wants to die with her and he loves her, evil veiny Willow and trusting friend Willow. She tries to hurt him but it is not use and she falls into his arms, sobbing. The world is safe for the moment.