Sykes

Sykes was a powerful Upper-Level demon who shared similar physical attributes with his demonic mentor, Belthazor. Sykes had a human form also, with his demon-self looking almost exactly like Belthazor; the two demons possibly belonged to the same species.

Similar to that of a stalker, Sykes took on Cole Turner's old cover as the Assistant District Attorney in order to get close to and kill good witches. He kidnapped Phoebe Halliwell, holding her hostage at Halliwell Manor, after she and her sisters catch onto him trying to frame, murder and replace Cole in the demonic hierarchy. He is murdered by Belthazor, who in turn, is murdered with a vanquishing potion by the witch that Sykes was originally after. She was also the fiancée of a male witch Cole killed while he still worked for The Source and the Brotherhood of the Thorn.

Like Belthazor, Sykes also had a shadow, that reported his findings to the Source (Cole's shadow to the Triad). As the ADA, he also was an employee of Cole's old boss and met the Charmed Ones as witnesses to a murder that he was investigating.

Hoping to emulate the legendary demon Belthazor, Sykes copied him by posing as an assistant district attorney and killing Witches. If not for the intervention of The Charmed Ones he would have slain all of the Witches in the triple crescent coven, rather than just one of their members. Once Sykes targeted a coven he did not rest until all of its members had been murdered. Thanks to a self-sacrificing gesture on the part of Cole Turner, Sykes’ rampage was stopped; an enraged Belthazor killing him with his own athame. Sykes’ preferred method for killing Witches was an athame but like Belthazor he was able to cast energy balls, was extremely strong and capable of shimmering. When in demon form he was large and muscular, with black skin and eyes and red facial markings.

Smart and tough, Sykes was extremely hard to dispatch; even capable of surviving a full powered energy ball. Yet, like all high level demons, a potion utilising a piece of his own flesh could vanquish him.

Trivia

 * During the big fighting scene between Belthazor and Sykes, Aaron Brumfield (demon Sykes) had to "choke" Belthazor. Michael Bailey Smith (Belthazor) said in a commentary that Aaron really began choking him (accidentally) and almost had to yell cut.
 * Sykes is a play on Yikes. When Leo walked in with the Toy Baby that was burnt, Piper said what happened, and Leo said Sykes.