Besides the standard "assassin" type of Darklighter, who strive to kill Whitelighters to leave their charges vulnerable or to kill Future Whitelighters before they can earn their wings, there are four other known types of Darklighters.
One type of Darklighter spreads evil through procreation, by seducing innocent mortal women and tricking them into bearing their progeny, similar to an incubus. It is against the rules to tell these women about who they truly are, so it is presumed that the women are abandoned once a child is produced.
Spirit Killers are Darklighters that seek to drive paragons of good to suicide and prevent them from achieving their destiny. They curse their victims with bad luck and manipulate them into a depression before driving them to suicide. This type of Darklighter is particularly known for targeting Future Whitelighters to prevent them from fullfilling their calling, as suicide would deny them the chance.
Trackers are a powerful breed of Darklighters who hunt Whitelighters that are about to "lose their wings". They are more powerful than regular Darklighters and are often rogues that only answer to themselves. Trackers can be recognized by tribal tattoos on their face.
A fourth type of Darklighter was only seen in a parallel universe where moralities were reversed. Instead of being Whitelighters in this world, Sam Wilder and Leo Wyatt were Darklighters, leading to the birth of Darklighter-WitchesPaige, Wyatt and Chris. Aside from their wiccan powers, they seemingly possessed the abilities of a standard Darklighter.
Darklighters are not invulnerable and are thus open to many ways of being vanquished. Previous methods used were potions, athames, Energy Balls and witch powers such as Molecular Combustion.
Darklighters also appear to be susceptible to their own Darklighter arrows. However, some Darklighters are shown to be able to survive one of their own arrows, although it depends on the strength of the Darklighter and also that it shouldn't hit the vital points.
Alec: The first Darklighter encountered by the Charmed Ones. Alec fell in love with a mortal woman named Daisy, who he was assigned to impregnate. He was killed by Prue who switched powers with him and killed him with his own Touch of Death.
Spirit Killer: He tried to make Maggie Murphy kill herself by cursing her with bad luck and manipulating her. He then tried to drive Prue to kill herself after she intervened, but was orbed away by Leo.
Ronan: A Tracker Darklighter blessed by Cole with additional powers. He was used by Cole in an attempt to get the Charmed Ones to vanquish him. He was later vanquished by Cole with an Energy Ball.
Damien: Damien was a Darklighter who was sent by Gideon to kill Leo. He was vanquished by his leader with a poison arrow in order to stop him from revealing that Gideon sent him.
Salek: An upper-level Darklighter shown to have trained new Darklighters, including Sid. He was blown up by Piper after mortally wounding Paige and killing her charge. However, Paige's charge became a Whitelighter and saved Paige with her new healing power.
Rennek: A powerful darklighter and a long-time rival of Leo. He was first working with Neena, but later became a threat on his own by obtaining powerful artifacts and altering reality to grant magic to mortals. He was vanquished by Prue.
Wyatt Halliwell: When the future version of Wyatt was evil, he displayed the ability to teleport through black orbs like a Darklighter instead of the regular blue orbs.
Black Orbing: The ability to teleport through the use of black orbs.
Apportation: The ability to transport an object or person through planes from place to place. Darklighters most prominently use this power whenever they summon their crossbows and arrows, whose poison is lethal to all whitelighters and Elders.
Touch of Death: The ability to incinerate and kill beings with a touch.
High Resistance: The ability to be highly resistant to other beings' powers and magic and survive otherwise lethal attacks.
Sensing: The ability to sense the location of other beings.
Immortality: The ability to possess an inifinite lifespan and an arrested aging process.
Voice Manipulation: The ability to alter one's voice to sound like another or add an echo to one's voice when angered.