monsterguide2

Glory (Hell God)
Glory was one of three hellgods that ruled over a demon dimension, but her power started to outstrip that of her fellow hellgods. In fear that she would over poer them they struck first, and managed to expel her from their dimension, and trap her inside the human body (a man called Ben) and die when Ben did, but her power was too great and every so often, for a period of time, she could submerge Ben's personality and take over his body, making it look like her. When Ben wasin control he was a normal human, and had no memory of Glory's actions, and Glory had memory of Ben's actions while she was in control. Her power was severely limited by being in human form to only super strength, speed and invulnerability- while still very formidable, normally should would have been able to cast lightning bolts and perform other godlike acts. Her sanity was also being constantly deteriorated by this demension, and she had to suck sanity out of other humans to maintain hers. Her sole aim was to obtain the Key, Dawn, and use it to get back to her own demension, which would have the side effect of destroying this world. Buffy eventually defeated her by using a troll-god's hammer, weakening her to the point that Ben took over again, and Giles then killed the mortal Ben, killing Glory with him.

We got the information on this page from Buffyguide.com, Dusk 'Til Dawn and also from The Watcher's Guide 2.

Mayor Wilkins III
The mayor was a demon who was over 100 years old. He was the mayor of Sunnydale the whole time that Sunnydale has existed. However the smart thing is that he's changed which Mayor he is over the past years, i.e. Mayor I, Mayor II and more recently Mayor III. Willow and Oz found out about this. To protect himself he hired Mr.Trick to carry out any killing, and his major agenda the slayers. But also Mr.Trick helped out while the Mayor had to carry out his rituals leading up to the ascension. But Mr.Trick got unlucky and got killed by Faith. But then Faith then stepped in to replace Mr.Trick. The Mayor and Faith built up a Father/Daughter relationship. With all the rituals done and the day of the ascension approaching fast, which just happened to be Graduation Day too, The Mayor was ready. On Graduation Day The Mayor turned into a fully fledged demon, bigger and stronger than anything Buffy had faced before. So in come the graduating class, with their flame throwers and crossbows. Now this the Mayor was definitly not expecting. Buffy led him to the library, where there was enough explosives to put a whole in the school, and Giles pushed the trigger. A hole in the school made, and a burnt Mayor on the side.

Adam
Adam, is not a human, nor demon. He is a creation of Maggie Walsh. He is part robot, demon and human. He doesn't require food, and doesn't eat his kill. He killed Maggie his creator the first time her saw her. Adam was invincible, and was supposed to be a helpful soldier to Maggie and the Inititive. Adam teamed up with Spike wanting his help to kill Buffy and reward, remove Spike's chip in his head.
Adam was trying create to other things like himself, with some parts demon and human. Buffy ripped his power source out of him and stopped him from making future creations just like himself with the little help of her friends and a spell.

Maggie Walsh-
A world-renowned psychologist, is famous for her work in operant conditioning. She's also a professor of psychology at UC Sunnydale by day, and the scientist-in-charge of a secret government research facility by night.
Riley recognizes her as his commander, but he has no idea she has been feeding him behaviour modification drugs; spying on him and the other Commanders in their rooms, and that she and Dr. Angleman are building a supersoldier made of human, demon and mechanical parts.
When Buffy gets close to the truth, Maggie sends her on a suicide mission-not without regrets- and it's clear that she regards Riley as her something of a surrogate son.
When Adam wakes up, he sees Maggie first, and kills her with one of his pointy thingys.

Ethan- rayne
Ethan is an old sorcerer friend of Gile's, from the dark days in London.
Every time Ethan has appeared in Buffy
his has tried to create chaos or cast a spell and bad things have happened. He enchanted halloween costumes,
poisoned Gile's beer and her turned into a demon, and that's just to name a few.
However, after he turned Gile's into a demon and Gile's is turned back, Riley tells Buffy he'll be sent to a secret facility in Arizona. Will this be the last we will see of Ethan?

FAITH-
In the mythology of the Buffy universe, when one slayer dies, another is Chosen. At the end of Season One, Buffy was technically dead until Xander revived her with CPR. This activated Kendra, a Slayer who arrived in Sunnydale only to find that the former Slayer was alive. Buffy and Kendra joined forces against Angelus, Spike and Dru, and Kendra was killed.
The death of Kendra activated Faith. When the evil vampire Kakistos murdered her Watcher in front of her, Faith fleed to Sunnydale to look up the other Slayer. When Faith first appeared in "Faith, Hope and Trick", she lies to Buffy and Giles and tells them that her watcher went to the annual Watchers Retreat in England. Buffy's friends and her mother are drawn to Faith. She's flirtatious and friendly, and has "rather a lot of zest," as Giles remarks. She tells exciting stories of her adventures. Buffy has a mild case of jealousy over Faith . When Faith is fighting, she launches into bloodlust that clouds her thinking and, on more than one accasion, puts Buffy at risk for her life.
She doesn't trust men, insisting they're all animals out for the chase.
In "Revelations" she and Buffy have obviously become a team, working as partners to slay a bunch of vamps. They joke about the new Olympic category, "synchronized slaying".
A new watcher arrives in Sunnydale for Faith. She gives Faith her full attention.
But everyone soon finds out that Mrs. Post, the new watcher is not a good person at all.
Buffy keeps trying to reach out to Faith, but it's hard because her emotional wounds have scared the girl, but she's far from healed.
She loves slaying. She loves the battle. Faith is always sure she is going to win the battle.
She insists to Buffy that because their Slayers their different, they are better. Moreover, they are above the law. Buffy reaches out to her, as well as Xander. She nearly kills him.
One night while Buffy and Fith are patrolling, Faith accidently stakes and kills the Deputy Mayor of Sunnydale. The taste of killing is in her mouth now. Imprisoning her in a sort of intervention.Angel tells Faith that she's got to let it go, or it will turn her into a monster.
Faith is on the edge of trusting him, opening herself up to the possibility of redemption, but Wesley and his henchmen capture her. Her last bit of trust has been completely shattered, and Faith goes over to the dark side - she becomes the Mayor's personal Slayer.
The Mayor showers Faith with affection and attention. He acts as a father figure for Faith. She does everything she is told, even betraying her 'friends'. When she believes Angel has turned bad again and is going to help her torture Buffy to death, she unloads: Buffy is always the centre of everyone's universe, even if Faith is the one who saves someone. Buffy is the good one, the decent one. While she, Faith, is trash.
The Mayor doesn't believe that Faith is trash at all. The opinion from someone so evil makes Faith commit more brutal crimes. Faith nearly kills Buffy's friend Willow and nearly kills Wesley. But Faith is looking forward to the Ascension, when the Mayor will let her show her self of best.
Faith poisons Angel with a poison arrow and the cure is the blood of a Slayer. The Slayer would have to be drained of her blood and it would kill her. Buffy is determined to find another way to cure Angel, but there is none. Buffy goes to Faith's apartment to the balcony. Buffy stabs Faith with Faith's knife which the Mayor had given her. Faith starts loosing a lot of blood. Faith umps of the balcony and lans in a truck which was driving by. Faith then ends up in a comma.
Buffy also ends up at the same hospital as Faith because Buffy made Angel have her blood, which nearly killed her. They communicate via dreams, and Faith reveals to Buffy how to defeat the Mayor.
At graduation day, Buffy defeats the mayor when he is in his demon form.
In "This Years Girl", Faith awakens from her coma and finds that graduation day is well over and that the mayor has been defeated. The Mayor, the only person who ever cared for her, has left a little gift for Faith. The device would allow Faith to switch bodies with whom she may wish, and she chooses Buffy. At the end of "This Years Girl" she does exactly that. She discovers what it's like to have people genuinely and honestly care for you.To feel graditude from someone whose life she's saved.
This is all too much for Faith. When she and Buffy battle, and she returns to her own body, she leaves town in a state of confusion. Things are not as she had assumed. She's not sure they ever were.
She arrives in L.A, where Angel and Wesley are helping the helpless..
In L.A Faith was hired to kill Angel by the lawfirm Wolfram and Hart. When she found Angel, she attempted to get Angel to kill her instead. She could no longer withstand her pain. She eventually broke down into Angel's arms. Angel watched over her and finally he could see that she wanted redemption. Faith turned herself into the poilce, since she was wanted for many reasons, and is currently in a L.A prison.
Faith broke outl after around three years in prison to help save the world, kill The Beast and bring back Angel. Wesley went to tell her they needed her help. Faith battled against Angelus many times and was beaten up badly by him and The Beast but Angelus suprisingly decided to kill The Beast and that brought back the sun to L.A.
Faith took charge of the situation and Evil Cordy wasn't happy at all. In one fight against Angelus, Faith had gotten biten by Angelus himself but Faith didn't get turned or die because she had injected a magical drug which affected herself and Angelus, they both feell into a deep, deep sleep, like a coma.
Welsey rescued Faith after just sirviving teh fight with Angelus and they brought Angelus back to the hotel and locked him up in the cage.
Faith and Angelus re-lived Angel's good deads and Angel and Angelus had to battle against each other. Faith was dying but Angel didn't give up on her because she never gave up on her.
Faith suddenly awoke from her comma and she saved Angel because Connor was about to stake him.
Willow had restored his soul for the second time and both Faith and Willow said their good-byes and left for Sunnydale.
Faith was going to help Buffy and the Scoobies save the world from The First Evil.
Faith battled against evil when Buffy needed her too and did her best as a Slayer.
Faith became the leader once for the potentials because everyone had kicked Buffy out of the leader role because they thought her judgement was not right, she needed a break from being the leader and everyone put Faith in charge, Faith didn't mean to kick out Buffy and Faith didn't want this at all, she never meant to be the leader, she didn't ask for it. Buffy told her it was up to her, to keep the girls safe.
Buffy finally came back to leader and Faith was again now a follower.
Faith fought the good fight in the final battle and survived.
Ya gotta have faith.

For more information on Faith go to Bad Girls.

Joss whedon has been quoted as saying that Faith is Buffy's shadow self. Faith is what Buffy might have become, if she hadn't had friends and family to support her. Faith dropped out of High School. Her mother was trailer-park trash who wouldn't even let her have a puppy.
From the Watcher's Guide 2