Seth

Seth (Kamandi Roberts) was a time traveler from 2015.

Before the Event
Seth was a test subject of Zion's diabetes "cure" research. He developed pancreatic cancer and died in September of 2014.

Season Two
After his death, Seth found himself forever trapped in the Dream World. Eventually he encountered Brian, who claimed to be a fellow time traveler. Seth convinced Brian to check in on his past self, and when Brian returned, he told him he is okay. Brian then tried to coach Seth into manipulating the dream world to make it his own. After Brian left, Seth created a town. When Seth excitedly tells Brian, he is warned that all the people he'd created were people from his past. Seth realized that Brian is the re-creation of a boy whose death he'd accidentally caused. Brian trapped Seth and left, having taken control of the dream. Seth was soon found by Warren Rennie and Rachel (Figment). Brian appeared and freed Seth, but told them never to enter his town. Seth soon learned that Warren was real, the time travel story was real, and Rachel was a figment, but less evil than Brian. The last fact proved to be a lie, as Rachel figured out how to absorb Seth's life force, making Seth vanish from the dream world's reality.

Season Three
The figment of Rachel, now real and alone, created a figment of Seth to represent her own guilt. He then tricked Rachel, in a similar way that Brian had tricked him, into letting her guard down, and he was able to steal her life force, making her vanish.

Appearances
Season Two (2013)

2013

Demons

Axiom

Lost Time

Penumbra

Umbra

Season Three (2015)

2014

Everlasting Chains

The Grace of Our Lord