- He's currently 26 years old.

- He doesn't enjoy killing innocent people. He just does it because Slenderman makes him. However, he'll take any chance he has of killing abusive parents, rapists, etc.

- Due to the scars extending from his mouth, he can't eat spicy food anymore. He also has to drink from a straw.

- Jeff's pure white, sandpaper-like skin and straight black hair are results of experimental medications the doctors used on him when he was in the hospital for his burns. But he still has burn scars, one of which is on the right side of his face and blinds him in one eye. His right ear is also burned severely, so he's hard of hearing in that ear.

- Before he was burned with hand sanitizer and rubbing alcohol, Jeff had curly, sandy brown hair and porcelain skin. He looked noticeably different from the rest of his immediate family, and his parents hated it.

- His eyes have always been blue, and he never chopped off his eyelids. But due to damage from the fire, he has to use reading glasses. Ben just stole some glasses from a kid he killed and prayed they were the right prescription for Jeff.

- Jeff was completely nonverbal until he was 5. His first word was Liu's name.

- Although he genuinely regrets what he did to his brother, he doesn't regret what he did to his parents at all.

- His favorite band is Motionless in White. He also loves Slipknot and My Chemical Romance.

- Jeff's voice is kind of raspy because his vocal chords were damaged in the fire.

- When overstimulated, Jeff will go nonverbal and will use hand gestures and body language instead. Only a few certain people are able to understand what he's trying to say. With people he trusts, he took the time to teach them Morse code, which he and Liu learned to use when they were kids so they could communicate.

- He's an emo, and was influenced to be one by Liu when they were children. For example, Liu taught him how to do eyeliner. But he also listens to metal.

- Jeff doesn't like admitting it, but he's afraid of heights.

- He tried smoking once, but he hated it.

- It takes a while for someone to earn his trust. But once they do, he's fiercely loyal and undeniably a good friend.

- Liu, Ben, S.O.S., Nina, Rouge, and Alma are the only people Jeff is comfortable talking about his emotions with.

- Jeff took Alma under his wing and sees her as a little sister. He regrets traumatizing her, but Alma was able to forgive him.

- Despite their violent breakup when they were 15, Jeff and Nina have become friends again. Like with Alma and Liu, Jeff regrets what he did to her, but Nina forgave him: she understands that it was an accident. They now have a brother/sister relationship.

- Jeff isn't an outright bully, but he can be snappy and he definitely has anger issues.

- The day Jeff was discharged from the hospital for his burns and attacked his family was June 2nd - his 14th birthday. He refused to acknowledge his birthday for years.

- He was partially under Slenderman's control when he went rogue and attacked his family. By the time he had snapped out of it, he had just "killed" Liu and was horrified to see what he had done. He started shaking Liu and begging him to wake up, but he gave up. He then cuddled up next to Liu and wrapped his arm around himself, lying there crying until he could hear the sirens. He was too distraught to notice that Liu's body was still warm.

- When Jeff first moved in with the other members of the Slenderman Alliance, he didn't have anyone to go to because Ben hadn't forgiven him for what he did to Liu yet. Jeff was surprised when Rouge took him under her wing, and although he acted like he didn't want to be taken care of at first, at the end of the day, he was a scared kid who had lost everything. He's one of the handful of proxies who call Rouge 'Mama,' and he views her as the loving mother he never had.

- Due to his trauma of being set on fire, he dislikes both fire and ginger hair. When he sees someone with ginger hair, all he can think of is Randy and what he did to him. He hardly ever admits it, but he's scared of Randy and avoids him at all costs.

- He has seven knives. He doesn't use the kitchen knife he used for his first kills because it was the knife used to attack Liu. But he still keeps it because he had used it to kill his parents.

- When Jeff ran away from home, he took a dark gray hoodie Liu owned with him. It became his comfort item, and he started wearing it as pajamas. He eventually gave it to Hector for his 6th birthday and told him to take care of it.

- Jeff utterly despises Slenderman, so he often disobeys him. But Ben, S.O.S., Alma, and Rouge are always able to get him out of trouble.

- He and Ben are childhood best friends. Jeff was in the backyard when Ben was drowned in his own bathtub, and while he was out there, Jeff saw Slenderman. Jeff blames him for Ben's death, but he still wishes he could've saved him. He was also the one to discover Ben's body, and he has PTSD from it.

- He was born premature, and with a broken leg.

- Jeff's special interests are knives, horror movies, and true crime. He also kins Jason Voorhees and Rob Zombie's version of Michael Myers.

- He's skinny, but fit. He also has a lot of stamina from playing soccer as a child.

- One of Jeff's hallucinations is an image of Liu's corpse with black eyes. During the first few months after his big mental breakdown at age 13, the hallucinations were really bad to the point where he tried to kill himself. Luckily, Rouge saved him just in time.

- When Toby first moved into the Alliance, Jeff had already been there for over a year. He started following them around because he thought he looked like Liu, and Toby took him under their wing and manipulated Jeff into seeing him as an older brother. This culminated in a few long years of emotional and mental abuse.

- He doesn't like to admit it, but Jeff is still very attached to his brother - after all, Liu was basically the one who raised him. When they were kids, he even called him "Dad" a few times on accident. Sometimes, when he's in a bad place mentally, he'll call Liu and Liu will spend the night in Jeff's room while S.O.S. sleeps in Hector's room. S.O.S. doesn't mind at all. Jeff worries about Liu a lot.

- Every so often, Jeff has really bad nightmares.

- He hates being referred to as "Jeffery," because that's what his parents called him.

- Jeff taught Sally to swear properly, which he finds hilarious.

- Jeff tried to commit suicide when he was 12 by slitting his wrists. His mother wrote an article about it for "awareness," but Jeff and Liu knew it was just for attention.

- During his entire middle school experience, Jeff was bullied relentlessly by Jane, who made him an outcast, beat him up often, and called him things like "crybaby" and the R slur. Because of this, Jeff doesn't regret what he did to her. His mindset is that he won't apologize until Jane does, because Jane started their feud in the first place.

- Because of his autism and other mental issues, he was prone to outbursts as a kid. Nowadays, he hates it when people see him cry, and he doesn't like appearing vulnerable because he fears being made fun of or taken advantage of.

- He has a policy of never killing anyone under 16 unless he knows that they've done something truly terrible.

- When he was a kid, Jeff was forced by his parents to play soccer for his school team, but he actually ended up enjoying it. He still likes playing soccer with Hector, Prairie, and Gideon, and Ben and Sally will sometimes join in.

- Jeff has stopped hiding the self-harm scars on his arms.

- His fingers are scarred from the fire and he sometimes has tremors in his hands.

- He always wanted to learn the drums, but his parents didn't let him and he never got the chance.

- When he was younger, he admired Lyra a lot, even though he only met her once before his accident, and he was one of the only kids his age in town who wasn't scared of her. He actually asked for her autograph when he first met her, and Lyra sometimes teases him about it.

- He's the type of person to randomly call people the F slur.

- When it comes to the people he cares about, he's very protective, but he doesn't like admitting it very often.

- He has a stick-and-poke set. He's given himself a few stick-and-poke tattoos.

- Jeff calls Liu "big man."

- He has a dart board full of knives in his and S.O.S.'s room.

- Before he found out Liu was still alive, he didn't like it when people brought him up. In fact, the only people in the Slenderman Alliance who knew about him were a handful of people.

- He pierced his own ears with a safety pin, but his right ear got infected due to it having been burned in the fire, so he can only wear earrings in his left ear. He tried to pierce his septum, too, but it didn't work.

- When someone annoys him, he chases them around until he catches them and tackles them to the ground.

- He often gets into fights with Eyeless Jack, whom he shares a cabin with. He calls him "Eyeless Jackass" and "grandpa."