Jasper was part of the original 100. He was arrested along with his best friend, Monty Green, for stealing herbs from the Ark garden and sent to juvenile lockup. Jasper was a Gunner for the Delinquents against the Woods Clan. Jasper also served as the primary chemist for the 100's time on Earth.
Jasper battled PTSD that developed after he was speared in the chest in "Pilot." This has continued on throughout the second season. He was initially supposed to be a minor character that died in the "Pilot" but his fate was changed due to the cast and crew liking his character so much.
While inside Mount Weather, Jasper became dependent on the Mountain Men, believing they had the Delinquents' best interests at heart. When Jasper learned the truth, however, he was determined to save his people and leave Mount Weather, becoming a leader for the Delinquents trapped inside.
In Season Three, Jasper became severely depressed due to Maya's death, and he developed grudges against Monty and Clarke. He made several attempts to drink himself to death, but fought against it. He later joined a resistance of Sky People, who fought the Artificial Intelligence A.L.I.E. after she took control of nearly all the Arkadians and residents of Polis. He eventually took the chip himself to try and relieve the pain of losing Maya. He was released from the city of light after Clarke pulls A.L.I.E.'s kill switch.
In Season Four, Jasper was much of the same, coming moments away from committing suicide with a pistol before being interrupted. However, after learning that there was another nuclear apocalypse looming and there was very little hope for any of them to survive, he became more cheerful. He entered a mode of disregarding his actions, believing that since they were all going to die soon anyway, that he won't be around to reap the consequences. When the rest of the Sky People leave to go to the Second Dawn Bunker, Jasper decided to stay behind at Arkadia in order to die. He had one last talk with Monty before he died from overdosing on the tea that he made from the hallucinogenic Jobi Nuts, committing suicide as he begged Monty to say his last words before he dies as Monty watched in despair.
Jasper was born on The Ark to chemist parents. He is best friends with Monty Green and did great in chemistry class. At some point before his crime, Jasper attended a Masquerade dance with his friends where he first saw Octavia Blake, who he grew a liking to.
In Pilot, Jasper is seen on the dropship with Monty Green talking. Outside of the Dropship Jasper approaches Clarke Griffin and briefly flirts with her until Wells Jaha pushes Jasper away from them, which inadvertently causes a conflict between Wells and John Murphy.
Later, Jasper and Monty are talking with other Delinquents when they're roped into Clarke's journey to Mount Weather by Finn and Octavia also joins them. While they are walking, Finn places a flower behind Octavia's ear and Jasper mentions to Monty that Finn has game. Monty mentions the flower is poison sumac. Finn asks how they got imprisoned. Monty and Jasper hint they were arrested for stealing pharmaceuticals ("herb") from the Ark gardens and forgetting to replace it. Jasper asks Octavia what she was arrested for. She replies for being born and rushes off to join Clarke and Monty makes fun of Jasper by telling him that upsetting her is not game. Minutes later they see their first animal, a deer. Jasper watches in awe until Finn snaps a twig and the deer turns to them shocking the group with its two heads.
When they arrive at a river, Jasper watches in awe as Octavia strips. When she jumps into the water he is shown to be fearful because they don't know how to swim, however, Octavia stands up. While they start to get undressed to join her, Jasper notices movement in the water. He orders Octavia to get out of the water but it's too late and Octavia is attacked by a sea serpent and taken under the water. When the group realizes she is still alive, Jasper jumps in and saves Octavia. Later that night, Jasper sleeps near Monty with Octavia's head on his chest.
The next morning they find another way to cross the river. To impress Octavia, Jasper convinces Finn to let him swing across the vine first. Landing safely on the other side Jasper finds an old sign indicating they've made it to Mount Weather. He holds the sign up into the air and the others cheer. Moments later, Jasper is pierced in the chest with a spear, leaving the rest in shock.
In Earth Skills, Clarke, Finn, Wells, Bellamy, and Murphy search for Jasper, tracking him by his blood. They find him tied up to a tree as bait. They release him and they bring him back to the Camp. Clarke treats his wounds and says that he might die if they don't get medicine soon.
In Earth Kills, Jasper has still not recovered from his wounds and Clarke is forced to cut away the infected flesh around his wound. Bellamy tells Clarke that if Jasper does not improve by the next day, he will kill Jasper. While Clarke, Finn, and Wells go in search of a seaweed that will help Jasper, Monty and Octavia stay behind to take care of him. During the night all the Delinquents are forced to take shelter in the dropship due to the Acid Fog and many become annoyed with Jasper's moaning in pain. Murphy decides to kill him, however, Octavia and Monty stop him by barricading the upper level of the dropship. The next day, the others return with the seaweed to help Jasper who begins to make a recovery and asks Finn for a drink of the whiskey he found.
In Murphy's Law, Octavia tries to get Jasper to leave camp but John Mbege grabs her from behind, frightening Jasper. He then trips when he tries to return to camp and finds a knife and the recently murdered Wells' disembodied fingers. They take the knife back to camp and show it to Clarke and Bellamy, who discover the initials J.M on it and confront Murphy about it. It turns out, however, that Charlotte is the real murderer. Murphy decides she needs to be punished and Jasper tries to stop him but gets punched while doing so.
That night after Murphy is banished, Monty is almost finished establishing a way to communicate with the Ark through their wristbands. He has Jasper put the finishing touch, however, the radio does not work and instead fries all the remaining Delinquents' wristbands. Jasper then laments that he is cursed. Octavia tells him that he is not cursed but brave and kisses him.
In His Sister's Keeper, Jasper eagerly joins Bellamy, Finn, and some other delinquents to search for Octavia who has gone missing. They eventually find tracks leading into the Grounders territory and most of the Delinquents turn back but Jasper continues on with Bellamy, Finn, John Mbege, Zoe Monroe, Diggs, and Roma. They soon lose the trail and are ambushed by the Grounders, who manage to kill John Mbege, Diggs, and Roma. Enraged Jasper calls them out and they begin to move in on the survivors, however, the Grounders hear the sound of a horn and scatter. Finn realizes it is the same sound he had heard previously before the acid fog, so they take shelter under a tarp.
Bellamy soon realizes there is no fog and they spot a Grounder running through the forest and they follow him back to his cave. Once inside they find the Grounder unconscious and Octavia trying to unlock her chains. Instead of leaving, Bellamy wants to kill the Grounder but Octavia begs him to spare the Grounder. While they argue the Grounder stabs Finn and defends himself against Bellamy. Jasper manages to get behind the Grounder and hits him over the head, knocking him out. They leave the Grounder chained up in the cave and take the wounded Finn back to camp as the storm begins.
In Contents Under Pressure Monty and Jasper are mentioned as having not made it back to the dropship during the storm and they presumably found somewhere to take shelter until it passed.
In Day Trip Monty and Jasper are snacking on seeds and nuts as they assist in the sorting and organizing of supplies for the upcoming winter. Jasper notices that Monty is acting a little weird and leaves him to go pee. While he's doing so, Jasper begins to hallucinate that the Grounders have surrounded the Camp. He runs to Octavia and she realizes he's been drugged from the jobi nuts he and Monty were eating. She gives him an "anti-grounder" stick to hold onto to protect himself from the Grounders. He is later seen cradling it in his arms.
In Unity Day, Jasper is seen bringing out moonshine as the Unity Day speech is given. Later on, he visits Raven Reyes and gives her a drink as they discuss how to test the gunpowder. Bellamy interrupts them, needing Raven's help to follow after Clarke and Finn, who are meeting with the Grounders in hopes of forming an alliance. Jasper goes with Raven and Bellamy as back-up. Once there, he watches in disappointment as Octavia hugs Lincoln. As the meeting begins, Jasper notices Grounders hiding in the trees and he opens fire on them. He manages to kill two before fleeing back to camp with the others. When they return, Octavia yells at Jasper, saying he ruined the possibility of a truce.
In I Am Become Death, Jasper was shown to be standing around a campfire, boasting about how he killed two Grounders at the bridge meeting. Octavia is irritated by it and Monty tells her to let them enjoy it as Jasper recieved a new tent from Bellamy. After a while, Harper enters Jasper and Monty's tent and says that she wouldn't mind coming by, but Jasper brushes her off. Monty warns Jasper that Octavia isn't going to happen, but Jasper tells Monty he's jealous and should find somewhere else to sleep.
When someone sets off the tripwire that was surrounding the camp, they find Murphy, all beaten up and bloody. After Murphy infects everyone with the disease that he was carrying, Bellamy orders Jasper to shoot the bomb that was going to blow up the bridge.
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