|This article is about a canonical subject whose real name is unknown, and is known only by a title, nickname or alias.|
- "Bottom line is even if you see 'em coming, you're not ready for the big moments. No one asks for their life to change, not really. But it does. So what, are we helpless? Puppets? No. The big moments are gonna come, can't help that. It's what you do afterwards that counts. That's when you find out who you are. You'll see what I mean."
Whistler was conceived by a humanoid pure-blood demon and an agent of the Powers That Be, an unthinkable union. The Powers and demonkind united to punish the couple; the couple was killed, but the child of their union was left behind. Though demons wanted to kill it too, the child was subsequently protected by the Powers. They sought to put this unique child, Whistler, to good use, by making him an agent of maintaining balance in the universe. They bestowed upon him the power of precognition.
Whistler's career saw him appear in Ancient Greece, usher Arthur towards the sword in the stone in medieval England, and even burning down significant buildings in later human history. After centuries of this sort of activity, he became convinced of another way to maintain the balance between good and evil: the prophecy of Universal Recreation, which centered around the Slayer Buffy Summers and a vampire with a soul, Angel. Whistler believed this to be a sort of cosmic irony, given its resemblance to his own origin.
Putting Angel on his Path
- "You could become an even more useless rodent than you are right now, or you could become... someone. A person. Someone to be counted."
- ―Whistler to Angel[src]
Whistler, whose real name was unpronounceable for a human as it consisted on a series of whistles, referred to his mission as "maintaining the balance between good and evil". In 1996, he was present in New York City, where he approached the vampire Angel. At the time, Angel was living on the streets, feeding on rats and refusing to come into contact with any human being, fearing to fall to his impulses and feed on one of them, as he had done in the 70's.
Whistler convinced Angel to join him on a trip to Los Angeles, where the two witnessed Buffy Summers being informed of her calling as the new Slayer, and later witnessed her first slaying. Whistler warned Angel that this new, unprepared Slayer would face serious danger. Having fallen in love with her, Angel asked Whistler to train him, to show him how to become someone to be counted on.
Two years later, Whistler, aware of the upcoming awakening of the demon Acathla, traveled to Sunnydale to seek out Angel, whom he believed was destined to stop the demon. He met Buffy at Rupert Giles' apartment, telling her he had not foreseen Angel losing his soul and she needed to be ready to do more than just fight if she wanted to stop the end of the world. Whistler's words proved true when Buffy was forced to send the re-ensouled Angel through Acathla's vortex in order to put the demon back to his eternal sleep.
Role in Universal Upheaval
- "You can save the world together, but only if you're not together. You have to decide where your loyalty lies... with the girl or with the world."
Years later, Whistler approached Angel with the bleak news that in most possible futures he had foreseen, Angel fighting alongside Buffy would result in them losing against the coming darkness. Instead, he advised Angel to take up the mantle of "Twilight" and attempt to limit the power of the anti-Slayer factions and manipulate them by directing their actions, while also guiding Buffy toward ultimate power.
A few months after Buffy and Angel desert Twilight, and the destruction of the Seed of Wonder, the heart of magic, Whistler apparently was unable to contact the the Powers That Be, and his clairvoyant powers were no longer working properly, and he blamed Angel for not going through with the plan. He approached Pearl and Nash, a pair of half-demons who had been part of Twilight's cabal, after they had massacred all the patrons of a bar and informs them that the world which doesn't know it's dead yet, needs to evolve. The duo accepted Whistler's proposition for the sake of bringing in the next stage of evolution and getting payback on their old boss.
Attempting to find Angel, Whistler tracked him to Giles's former apartment- where Angel now lived with Faith as he attempted to complete Giles's unfinished business and find a way to bring the now-dead Giles back to life-, but only discovered Giles's aunts as Angel was currently in another dimension with Faith, Willow and Connor. Informing the Giles family that he intended to complete the ascension that Buffy and Angel had interrupted as part of a plan to save the world by evolving it to the next stage, Whistler gave the aunts a card with an address on it and told them them to tell Angel to meet him there on their 'anniversary'. 
Whistler's meeting with him went as scheduled, briefly coming to violence when Angel showed his fury of him working with Pearl and Nash but it was quickly ended. He talked with him about destiny and expressed his anger that he had deserted the Twilight plan. Angel, however, remained unrepentant and defended himself, explaining that their friends were in danger and Buffy needed his help. Whistler admitted flippantly to him that at least two billion people were meant to die in order for the Universal Recreation prophecy to be completed but it was necessary for the balance. He revealed to him his origins and how Angel was predestined to meet Buffy but falling in love with her was unexpected, greatly shocking Angel. Whistler also mentioned to him that before all of this had happened, he saw a possible future for Earth that was dark and grim, one that he wanted to be avoided. He asked him to help him "save the world" and restore balance.
Though Angel admitted that he would always be grateful to Whistler for introducing him to Buffy and giving him a chance for redemption, he made it clear that he would not help Whistler if innocent people had to die in the process and would not let him cause any more collateral damage, bluntly stating his belief that Whistler had gone insane from being cut off from the dimensions. Outraged, Whistler attacked Angel and nearly staked him before managing to stop himself, stating that Angel was still his "favorite kid" and he didn't want to kill him. However, Whistler nonetheless warned Angel to stay out of his way or he would be forced to do so. 
When Alasdair's "cloaking device" for his magical items is shut down in an effort to help ressurrect Giles, Whistler and his group quickly arrive on the scene. Pearl and Nash fiercely fought with Angel and Faith, intending to steal the items neccessary. Eventually, when the three manage to steal the items, Whistler ordered the two of them to retreat since they had gotten what they wanted. Relucantly, they obey and Whistler left again with them on his mission.  Giles miraclously is ressurected, but as a twelve year old boy. With Giles urging, Angel and head out to stop Whistler's plan. After the group comes up with a battle plan, they head to a roof top in Hackney, as Nadia, Slayer with a vendetta against Angel, presues them. As they confront Whistler, Peral and Nash, they unleash their magical plauge.
Personality and Traits
- Whistler: "Body like yours - I'd pretty much give up my soul for a shot at that, too. But it took Angel off the roster. Which puts you on the spots in a big way. What are you gonna do? What are you prepared to do?"
- Buffy: "Whatever I have to."
- Whistler: "Or maybe I should ask, what are you prepared to give up?"
- — Whistler and Buffy Summers[src]
Despite the important mission he performed for The Powers That Be, Whistler remained a down-to-earth individual. He was also prone to sarcasm and irony, for which people like Angel and Buffy found him somewhat annoying. However, despite his way of relating to people, he remained a wise figure ready to offer guidance, despite not being asked to.
Following the failure of the plan to evolve the world into Twilight and the subsequent end of magic, Whistler became more short-tempered and hostile, preferring to continue with his plan in the belief that he was 'saving' the world rather than allowing Angel and others to try and tackle the problem their own way.
Powers and Abilities
- "Anyway, I've seen some of the futures."
Whistler possessed a psychic link to the Powers That Be that allowed him to perceive potential futures, though he was unable to foresee everything, as he failed to foresee Angel losing his soul. However, after the destruction of the Seed of Wonder, his powers became severely affected. During a confrontation, he displayed a degree of superhuman strength and the ability to apparently generate blue energy from his hands, although the extent and nature of this power is unclear. He also possessed enough skill in hand-to-hand combat to overpower Angel in a fight.
Behind the Scenes
- He was portrayed by Max Perlich.
- Whistler was originally planned to serve as a sidekick for Angel on the Buffy the Vampire Slayer spinoff, Angel, but Joss Whedon cited schedule conflicts with Max Perlich's film career as the reason for replacing Whistler with Doyle, a similar character. Some fans contend that the "real" reason was a copyright issue with Marvel Comics, whose own character named Whistler is a sidekick to their heroic dhampir (human/vampire-hybrid), Blade.
- Whistler was also planned to appear on the never-produced Ripper, a Buffy the Vampire Slayer spin-off detailing the adventures of Giles in England.
- "Becoming, Part One"
- "Becoming, Part Two"
- "Buffy the Vampire Slayer: Riley"
- "Live Through This, Part One"
- "Live Through This, Part Four"
- "Family Reunion, Part Three"
- "The Hero of His Own Story"
- "Death and Consequences, Part Three"
- "What You Want, Not What You Need, Part One"
- "What You Want, Not What You Need, Part Two"