Jeremy Gilbert

Jeremy Gilbert is the adoptive brother and biological cousin of Elena Gilbert and he is a medium. His best friends are Matt Donovan and Bonnie Bennett who is also his girlfriend. Since he came back to life, he's been living in the Salvatore Boarding House with his sister (when she's not at college) and her boyfriend, Damon Salvatore since their house was destroyed by her after his death.

Prior to the beginning of the series, his parents died in a tragic car accident that Elena managed to survive thanks to a vampire, Stefan Salvatore. As a way of coping with the accident, he started dealing and using drugs but soon stopped after the death of his first girlfriend, Vicki Donovan, supposedly because of an overdose. He overdosed on pills after drinking vampire blood in the hope of becoming a vampire and being able to turn off his emotions. He did this following the death of his second girlfriend, Anna. However his attempt to become a vampire failed and the blood healed the damage the pills did.  

He started a romantic relationship with Bonnie Bennett which ended after he kissed Anna. Jeremy was shot by Sheriff Forbes after Damon dodged the bullet and was revived by Bonnie, who is a witch and has connections to dead witches with the power to bring him back. However the spell that caused him to be revived gave him the power to see ghosts and he was haunted by Vicki and Anna. He later went to live with family friends in Denver, after being compelled by Klaus to stand in front of a speeding car. Elena feared for his safety and got Damon to compel him to leave. He returned to Mystic Falls after Elena and Damon went to get him once Klaus found out where he was. He was turned into a vampire hunter and became a member of The Five. After helping Shane free Silas, he was forced by Katherine Pierce to raise the immortal, who then drained him of his blood and snapped his neck. He was able to survive numerous deaths due to the Gilbert Ring, but since he turned into a supernatural being, this death would last. His body was burned inside the Gilbert House because Elena could no longer keep the house after losing the only family she had left. So she decided to burn the house down to make it a good cover story for Jeremy's death.