Darius Pike

Darius was a fifteen-year-old boy who was employed as Professor Gryffen's personal assistant by The Department and was also part of K-9's alien-fighting team.

Biography
Darius was employed by The Department to keep an eye on the Professor. This meant he was his personal assistant and tended to his car, Mariah. He later met criminals Starkey, and Jorjie after encountering ,K-9 and Jixen and informed the Police robots. He later went with K-9 to rescue Starkey, though he still didn't like him. (K9TV: Regeneration) He once almost destroyed London when he accidentally unleashed a swarm of alien nanobots. (K9TV: Black Hunger)

Personality
Darius was a hard worker, and loyal to the the professor, whom he saw as a father figure. Being an employee of The Department, he did not dislike and distrust them as much as Starkey and Jorjie, and would even willingly go to them for help on occasion. (K9TV: Jaws of Orthrus) He disliked Starkey, believing his troublemaking ways would only bring the Professor strife, and K-9, with the two often getting into verbal (and sometimes physical) disagreements.(K9TV: Jaws of Orthrus) He had a crush on Jorjie (K9TV: Sirens of Ceres), and was heartbroken when she confessed to him that she had a crush on Starkey. (K9TV: Aeolian) He was very attached to Mariah, spending most of his free time polishing and working on her, and was quite angry when it appeared K-9 had damaged her. (K9TV: Jaws of Orthrus)

Darius was something of a pragmatist, abandoning his friends' plans when they seemed too outlandish or likely to fail, and seeking help elsewhere. He also had a habit of concocting get-rich-quick schemes, usually involving alien technology. (K9TV: Black Hunger)

His role in 'K9's gang' is similar to that of Clyde Langer in Sarah Jane's gang and Owen Harper in Torchwood Three.