- “For Kakistos, we live... for Kakistos, you die”
- ―Anonymous minion of Kakistos[src]
- “Kakistos is Greek, it means the worst of the worst. It's also the name of a vampire, so old his hands and feet are cloven.”
- ―Rupert Giles[src]
Already old in the time of Greek antiquity, Kakistos had unusually cruel habits regarding his prey. Rather than killing, or even turning all of his victims, he would often torture female prisoners, driving them mad until they became his servants. These mad women became known as the maenads.
At some point, the maenads raided the village where Artemia, the Slayer, lived. Although she was away at the time, both Artemia's husband and daughter, Alexandra, were present during the attack. Her husband was killed in the battle, but Alexandra remained hidden.
On the Father's orders, both Artemia and Alexandra were captured and tormented. Alexandra's mind was broken, and she made a deal with D'Hoffryn to become a vengeance demon. She then used her powers to destroy the maenads, and was about to grant Artemia her dying wish to destroy the Father when a battle in Arashmahaar erupted, robbing Malice of her powers. The traces of this wish would remain dormant for thousands of years.
During World War I, Kakistos offered his services to Kaiser Wilhelm II. Under the leadership of Crixus, vampires would drop on enemy forces and feed on or turn them. However, the vampires also attacked German forces. After each attack, the vampires would leave behind a symbol painted with the victims' blood. 
Sunnydale and the Slayer
- “I'm going to rip her spine out of her body, then I'm going to eat her heart and suck the marrow from her bones.”
Years later, Kakistos was stationed somewhere around the East coast of America, possibly Boston. There, he confronted Slayer Faith Lehane, kidnapping her Watcher, Diana Dormer. After luring Faith to his lair, Kakistos ripped Dormer in two, and promptly captured Faith. Faith, however, was not as helpless as she seemed. With the aid of Artemia's spirit, she was able to land upon the Father both a sword slash to the groin and an axe wound that cleaved his face in two, a wound from which he would never fully recover. Faith was then able to set the support beams of his lair on fire, brining to entire structure crashing to the ground.
Kakistos traveled to Sunnydale to hunt down Faith. With him came an entourage of his minions, most of them fanatical followers led by Mr. Trick, Kakistos' right hand and a technophile, modern-minded vampire, who abandoned his mater to be slain by Faith and Buffy Summers.
- “There's a reason these vengeance crusades are out of style. It's the modern vampire who sees the big picture.”
- ―Mister Trick[src]
Kakistos was an old-minded, traditionalist vampire who revelled in the torture and mutilation of his victims. He seemigly did not approve of modern developments such as electric light, preferring to light his dwellings with candles instead. He had litle interest on modern comforts that would've allowed him to establish a power base with little effort. It was this short-sighteness that led Trick to abandon his Master to be dusted by the Slayers.
Powers and Abilities
Kakistos was an incredibly old vampire, having cloven hooves and a demonic visage. He possessed the same powers as other vampires, but seemed less vulnerable to wood, requiring a larger amount to be dusted. He also could sense the presence of Angel's soul.
One unique power that he possessed was the ability to "home in" on anyone bearing his mark. In this way, Artemia assured a confrontation between him and Faith by possessing the girl and forcing her to have his mark tattooed on her arm.
- Angel: Blood and Trenches
- Spike and Dru: Pretty Maids All in a Row
- Go Ask Malice
- Faith, Hope & Trick (1st Appearance)
- Chaos Bleeds