Back from the Dead: Twice. Her sisters still pulled it off more than her, though. She even returns in the comic books, too, years after she was Killed Off for Real. Course unlike the TV Show, there was no contract to prevent her from returning.
Killed Off for Real: Due to a case of Real Life Writes the Plot, when her actor left the show. She refused to come back, preventing her character from retuning, even as a white lighter (explained in show that the way she died wouldn't allow her to fully transfer to the afterlife).
Promotion to Parent: Though Grams was still around to take care of them after Patty died and Victor left, Prue took on a lot of responsibilities to help take care of her younger sisters: in the series pilot, Piper describes her as being more like a mother than a sister.
Earn Your Happy Ending: Her entire relationship with Leo. Both endure obstacles at every turn, gut-wrenching heartache, being separated from each other several different times, constant threats against their children, and betrayals from those they thought they could trust. They never gave up, and they got to grow old together and see their children lead full lives.
Mama Bear: Even before the birth of her own children, she had this aspect. Most notable was when a young witch was being held by some demons, she continually blasted the force field protecting the demon's domain until she ripped it apart.
Pregnant Badass: Enough to go up against an invincible demon and actually manage to knock him down a few times, while deflecting all of his attacks fairly successfully. It turns out being pregnant with Wyatt only made her more powerful, as she could draw upon his powers.
Paige: You know, this happened a little too easily. What if it's a trap?
Deadpan Snarker: Probably the least snarky of the sisters, but she is no stranger to it either.
De Powered: In Season 6, a magic court hearing ended up with her losing all the powers she'd gained up to that point (though she retains the ability to cast spells). She eventually regains her premonitions in Season 7, but not levitation or empathy.
Future Me Scares Me: She met an elderly woman who was herself from the future, and was a nasty, grouchy, bitter old woman. Phoebe then attempted to learn about the events that led up to this future, to prevent herself from going the same path. It didnot work.
In "Morality Bites," Phoebe is horrified that her future self murdered a man in cold blood with her powers. The man himself was a murderer, but Phoebe couldn't believe that she would break the rules and do such a thing. This causes the moment that most pronounces her leveling-up in Jerkass to date at the time, setting up an old friend to get killed by demons over a bank heist and thinking nothing of it afterward, to become that much more disturbing.
Informed Attractiveness: People on the show talked about Phoebe as if she were the most gorgeous creature to ever walk the Earth. While Alyssa Milano was certainly beautiful, she wasn't significantly more attractive than Rose McGowan, Holly Marie Combs, and Shannen Doherty.
Took a Level in Jerkass: Some think that Phoebe went from a likable, well-meaning ditz to a self-obsessed, selfish Jerk Sue as Alyssa Milano got more creative control. It's even been said that Cole's Batman Gambit-revealing guest return episode in Season 7 had him interacting with Piper rather than Phoebe because Julian had it put into his contract not to work any scenes with Alyssa.
Andy Trudeau (T.W. King)
Agent Mulder: Even before the events of the series, Andy specialized in the more unusual cases and was up to speed on the occult. As Season 1 progressed, he gained more of a reputation in this regard. After learning the big secret, he even said that he always believed in something beyond this world.
Heroic Sacrifice: Was killed by a demon while trying to help the sisters. He could've been brought back due to a Groundhog Day Loop, but he convinced Prue while in the afterlife not to let it happen in order to stop the demon.
Agent Mulder: An inversion. Even after learning the big secret, he still tries to solve rational cases and "be normal." However, his involvement in strange unsolved cases and his bringing in (what appear to be) psychic girls for consultation make him appear like this trope to his colleagues.
Agent Scully: Especially while partnered with Andy. He began to display a more open mind in Season 2 before learning the big secret.
Properly Paranoid: After Andy's death and before learning the secret himself, Daryl knew the sisters were hiding something. However, in a subversion, he didn't want to know the secret. He did, though, want to make use of their secret to help people when necessary.
Put on a Bus: The budget cuts in Season 8 led to Daryl being dropped altogether. "Run, Piper, Run" said he had moved back east with his family.
Properly Paranoid: He had his suspicions about Leo (though some of this was prompted by jealousy). The suspicions grew over time until he was absolutely certain that Leo was hiding something, which he was.
Crouching Moron, Hidden Badass: While certainly not stupid, his pacifistic leanings routinely kept him out of the fighting. The Elders and other Whitelighters also regularly "sold Leo short" (though this had more to do with his relationship with Piper). However, when the Titans slaughtered many Elders, it was Leo who stepped up, organizing ways to protect the survivors and giving the sisters godly powers to fight the Titans.
Earn Your Happy Ending: His entire relationship with Piper. Both endure obstacles at every turn, gut-wrenching heartache, being separated from each other several different times, constant threats against their children, and betrayals from those they thought they could trust. They never gave up, and they got to grow old together and see their children lead full lives.
Hurting Hero: For a good part of Season 7, Chris' death and Gideon's betrayal cause Leo to become a darker, more pro-active demon slayer in order to protect his family. His anguish and methods put a further strain on his marriage, making this more difficult for everyone.
Late Arrival Spoiler: When Leo first appeared, he seemed like any other handyman. The first hints of what he really was came half a season down the line in "Wicca Envy" and a full explanation a little later in "Secrets and Guys." Of course, every character bio notes he's a World War II veteran that ascended to Whitelighter status.
Locked Out of the Loop: For a while regarding Piper's pregnancy with Chris. To be fair, locking him out was easy since he and Piper alike didn't know it was POSSIBLE to get her knocked up in a dimension between life and death, and he had to hang with the Elders for a while immediately afterwards.
And I Must Scream: His fate after "Centennial Charmed" would seem to be this and may have been the intent. Trapped in a void, unable to interact with just about anyone, forever denied being with Phoebe, etc. However, it is amazingly subverted, as he has made peace with his fate and found a way to influence the real world.
Bad Powers, Good People: Cole's reasons (well the main one) for becoming insane and evil in Season 5 is because his powers were demonic and inherently evil which has been known to influence users. Another reason is that Cole was mortal when he absorbed the powers of the wasteland and mortals are unable to handle having magic powers without going insane or worse.
Cassandra Truth: Inverted in "The Demon Who Came in from the Cold," where Cole claims to his old brotherhood that he killed the Triad because they were plotting to betray the Source. The top demons remain suspicious of this claim to say the least, but Cole himself was lying about it as a cover. Thing is, as viewers learn in Season 8, the Triad actually was plotting to betray the Source and seize power for themselves. Cole was right; he just didn't know it.
Good Feels Good: While mortal, he helps to save a woman from a burning car and comments afterwards that it felt good, due to a combination of being able to help others and get some action in his somewhat dull mortal life at the same time. When he returns from death the first time, he uses his powers to save lives and help people for awhile, but eventually being treated like a fearsome scourge or tool instead of a person wore on him.
Heel Face Door Slam: His reason for turning evil again in Season 5. He wanted to be good, to help, to make up for past sins, but the sisters absolutely refused to even consider that he was anything but evil. To be fair he does a lot to inspire their distrust even while claiming to want to be good. The more likelier reason which is also said on the other wiki, is that Cole's powers are inherently evil which in the charmed universe means it influences the user to be darker and as a mortal he was unable to carry the burden of them which resulted in Sanity slippage and succumbing to evil.
Kaleidoscope Hair: Her hair is a different colour each season. Black in S4, Red in S5, Blonde in S6 and brown in the last two seasons. Phoebe also had six different hairstyles in the fourth season. In the premiere she was dark blonde but had gone all the way to an almost black hue by the finale.
The Unfavorite: In the unchanged timeline, to his dad. Of course, the fact that he's not nearly as powerful as Wyatt did little to help. He reacted with real indignation upon learning that Wyatt had powers while still in the womb, so one could imagine that he suffered from something of an inferiority complex.
Billie Jenkins (Kaley Cuoco)
Cain and Abel: She ends up having to kill Christy, the Cain, after she tries to kill Billie and the Charmed Ones. Even if you hate the Jenkins sisters, you have to admit that killing the Brainwashed and Crazy sister you spent your life searching for and trying to save up until that point is... well...
Cousin Oliver: It was her duty to attract a younger demographic and make the Charmed Ones hip again.
Put on a Bus: Disappears after the first season or so. When she returns for an episode, she justifies it as being because the sisters were no longer new to the craft and didn't need a familiar anymore.
Jerkass Gods: Well, that's how the sisters view them — especially Piper due to their opposition to her relationship with Leo.
Victor is such a Cool Old Guy than even in a Bad Future he’s considered to be “awesome”, as said by Chris himself, who obviously adores his grandfather
Daddy Had A Good Reason For Abandoning You: Victor left the family shortly before Patty's death, causing degrees of resentment among Prue, Piper and Phoebe. However, Victor left due to severe disagreements with Patty and Grams over the sisters' magical heritage and claims that he could never protect them from demons.
Deadpan Snarker: He has this at times. Mostly when he deals with his dead mother-in-law.
Determinator: After being stabbed in the gut, he wills himself to jump down some stairs and throws the demon holding Piper hostage.
Indy Ploy: When the girls' maturity was regressed to teenagers and Penny wouldn't undo the spell and Victor wanted it undone, Victor told her to call Patty to break the tie figuring there was a good chance Patty would side with him. It worked.
The Other Darrin: Was played by Tony Denison in his first appearance, but by James Read for all others.
Took a Level in Badass: While he was familiar with demons before the series started, as his appearances continued he became more calm around them and was always trusted to watch his grandsons when the need was there.
You Have Failed Me: The Triad don't take too kindly to being disappointed by their agents.
Shax (Micheal Bailey Smith)
Badass: When you manage to permenatly kill off a Charmed One you definatly count.
Blow You Away: His entire motif revolves around using the wind to teleport to places and to kill his enemies.
The Brute: In the sources heirarchy he seems to serves as his main muscle and little else. To give you some context whilst most upper level demons plans revolve around intricate ways to trick the Charmed Ones to get there target his main way is to crash through doors as loudly as possible and throw air balls at his enemys.
Dumb Muscle: He serves as the Sources personal assasian but dosent seem to be aware/or care about any of the subtletess most demons posses. In the Season 3 finale, despite the fact that exposure of magic would harm both good and evil, he intentionally attacks the Charmed Ones in brought daylight, TWICE! One thinks that the only reason the Source keeps him around is that he's good at his job.
Knight of Cerebus: Despite only appering in two episodes he leaves arguably the biggest impact on the series by killing Prue and ending the original Charmed Ones, his actions cause the Charmed ones secret to be exposed and gets worse from there.
Not So Harmless Villain: While never portrayed as being goofy because of his little screen time you would be forgiving for thinking he was just some random MOTW. Then he kills Prue...
Quizzical Tilt: Seems to be his default expresion right before he kills someone.
The Unfettered: Nothing will stop this guy from reaching his target even if he has attack the Charmed Ones and expose magic to do it.
The Voiceless: Despite appering in two episodes he only speaks once, two words: The end
Walking Shirtless Scene: Is constantly shown with an open shirt although in a rare moment of non fanservice this is used more to show just how demonic and wrong looking he is.
You Don't Look Like You: In his second appreance his skin and hair cooler look more greyish as oppose to his blue coloring in Season 3.
The Source of All Evil (Michael Bailey Smith, Ben Guillory, Peter Woodward, Julian McMahon, Debbi Morgan)
Back From The Dead,FOR The Dead: In an episode in Season 8, the Source is resurrected. Piper dispatches him by blowing up a demon he was psychically connected to, vanquishing both.
Legacy Character: Season 4 revealed that there have been multiple "Sources" over time — with the most powerful demons of the day seeking to prove their worth when the old one is vanquished and subsequently getting possessed by the true Source.
The Man Behind the Man: As early as Season 1, there were infrequent references to a great power in the Underworld. After being named in mid-Season 2, the Source was consistently referred to as the one that everyone answered to.
Crouching Moron, Hidden Badass: They were some of the dopiest villains the sisters encountered, barely a footnote in The Book of Shadows but they also had one of the most sound plans to defeat the Charmed Ones.
The Psycho Rangers: Much like the original Psycho Rangers, the only thing that caused their downfall was their own infighting. (Interestingly, Melody Perkins also worked with the original Psycho Rangers.)
Stylistic Suck: To help illustrate the fact that they were rather lame witches, the one spell they wrote was correspondingly bad.
Blinking faces, blank and ho-hum, We are they and they are no one. Grant us the Power of Three, And turn them into nobody.
Theme Initials: Mabel, Mitzy and Margo all have names starting with M, just as the Halliwell Sisters all start with P.
The Mentor: He was this to Leo, which makes his betrayal that much worse.
Properly Paranoid: He believed that Wyatt was too great a concentration of power and was a threat to all sides, meaning he had to be eliminated. When he learned about Chris' future, he felt justified. Of course, it was his own actions thatcaused that future in the first place.
And I Must Scream: Disembodied and what's left essentially imprisoned for a very long time. When he was finally freed, he said he already knew about the Avatar threat and that the Source was dead. This meant he was fully aware and conscious during his imprisonment.
Bad Boss: He really doesn't like to be questioned, especially after a failure. He once vanquished a demon for essentially saying, "I told you so." He also gained a reputation for losing demons in his schemes — some of which required said deaths to further his goals.
Batman Gambit: Zankou is all about this. Telling the Elders that Leo is an Avatar, convincing the sisters that the Avatars are a threat — he knew what their actions would be and banked on it all so he can have his opportunity to seize control.
Near Villain Victory: Easily the one that comes the closest of acquiring his goal. In fact, he did, he just didn’t have enough time to enjoy it.
Actually, there were others demons who accomplished their goals on the show, such as learning a truth or freeing their kind from their enemies, the same day they got vanquished as well. His was just the only one that was a real near-ultimate victory. Still very impressive, though.
Hope Spot: Being reunited with her parents weakened her resolve, which prompted the remaining member of the Triad to have them eliminated. This, coupled with other unfortunate events, keeps her on The Dark Side.
Even Evil Has Loved Ones: She is angered when a demon murders her parents shortly after she is reunited with her family, essentially because he was afraid she'd forget their plans and turn good. She punches through his chest and kills him in revenge. She also seems to genuinely care about her sister, Billie, which was why Christy's attempt to kill her came as such a shock.
Boisterous Bruiser: Future Wyatt is a cheerful, sweet lug who slaughters a roomful of demons with a gesture—and pretty much slaughters the room itself, too.
Brainy Baby: After Wyatt was born, Paige designed a security system to alert the family to demons teleporting into the house. After only two such instances, Wyatt figured out the system was a way of getting attention, so he used his powers to set it off.
Cain and Abel: Evil future Wyatt and future Chris had this sort of dynamic going on, although neither seemed particularly willing to kill the other.
Even Evil Has Loved Ones: When Chris is briefly brought back to his present, evil Wyatt says that he would've killed anyone else for doing what he did. Wyatt even offers Chris forgiveness in exchange for his loyalty.
In "Imaginary Fiends", evil Wyatt hesitates to attack his parents and aunts. Leo even gets through to him using The Power of Love, causing evil Wyatt to stand aside and watch on tearfully as his dad broke the curse that'd turned him bad.
Evil Detecting Baby: Wyatt tended to put up a blue forcefield if something evil came too close. Subverted when the plot needed a group to try and turn him by having the evil guy pretend to be nice and good.
Meaningful Name: Wyatt Matthew Halliwell. His first and middle names come from Leo and Paige, respectively. Piper specifically chose these names because of their actions to protect him in "Baby's First Demon".
Paint It Black: When a future version of Wyatt arrives in the present in "Imaginary Fiends", a demon named Vicus manages to infect baby Wyatt with evil and future Wyatt suddenly gains an all-black outfit as well as longer hair and a Beard of Evil—the same look he had in the original future.
Ret Gone: The plot of "Forget Me... Not" centers around Wyatt's inexplicable disappearance, not only from the Manor but also from the memories of his family. It turns out to be the work of the Cleaners after Wyatt endangered the Masquerade (more than they usually do, anyway).