Ken

"Ken" was the nickname of a unnamed Hive Lightbearer Knight paired with the Hive Ghost Fynch and served the Lucent Brood. As his Ghost turned against the ideals of the Brood, Ken would question Fynch's loyalty to him which eventually led to the Knight's demise at the hands of his own Ghost. Fynch keeps his body in his hideout in Quagmire.

Trivia

 * Unlike many Guardians, Ken was given a nickname rather than a traditional Hive-like name by their Ghost. This could point to him having an actual full name that is yet to be revealed.
 * During The Dawning, Fynch can be given a gift. Upon receiving one, he mentions that if he is given any extra gifts, he may wake up Ken while no other Lightbearers are around to see if The Guardian's cooking could change his mind.

List of appearances

 * Destiny 2: The Witch Queen