Dave

Dave is minor character in Season Six, who appears in two episodes, Nevermind and Matryoshka.

Early Life
Not much is known about Dave's early life but at some point, he was a college student on Earth, who had a crush on Josephine Lightbourne, before the first Nuclear Apocalypse in 2052.

Throughout the Series
In Nevermind, in a flashback in Josephine's memory, Josephine and her best friend, Olivia, were in a diner, talking about a "secret family project", when Dave came in the diner. When he arrived at the diner, he talks to Josephine about hanging out together. However, when Josephine refuses, Dave becomes emotionally depressed and upset, causing him to pull out the gun and commit suicide by gunshot, leaving Josephine and Olivia horrified. As a result, Dave's death causes Josephine to leave Earth on Eligius III to go to a new habitable world, called Alpha.
 * -| Season Six=

In 'Matryoshka', Dave appears again in the Mindspace. When Clarke opens the door, she sees Dave shooting himself in the head. Later, Dave is seen walking around in the Mindspace as Clarke and Josephine tries to find a way to keep themselves alive.