Sorry i don't have the best headcanons for these two because i think they are more like the canon versions of themselves-Nationality -
Isaac - because of his last name i believe he is 100% German. Not much else about it tbf, but he could be Russian, but i like to think of him as german
Lj - well he isn't any tbf, but if he were to be a nationality I'd say he was Russian in Germany. Idk why but he gives off depressing Russian vibes- but also a fucking idiot- i don't personally like LJ but. Uh. Ik two people who love him.
Ages -
Isaac - he is apparently canonically 20 when his parents died so imma say around 24
Lj - hundreds and hundreds of years old, having killed thousands of kids- the poor kids-
Accents -
Issac - he has a heavy German accent, also speaking slight German whenever speaking English. But other than that he is very good at speaking English just hasn't mastered a american or British accent when speaking English infront of English speaking people.
Laughing jack - he doesn't have much of an accent, sounding like anything he wants at any time, he can mimic voices of those people connected to his victim, making him more easily thought as a imaginary friend. But if he were to have an accent he would have a heavy Russian accent.
Disorders -
Isaac - schizophrenia
PTSD
Bipolar disorder (manic episodes)
Dissociative (idk the disorder but he has moments where he doesn't understand what he is seeing and these moments last from seconds to hours. It might be linked to schizophrenia though)Laughing jack - he doesn't have any mental disorders cause he is a "toy". He doesn't feel any emotions so he cannot develop disorders.
Friendships -
Isaac - no one, he knows no one and will never know anyone except jack. And they are certainly not friends anymore.
Laughing jack - he is decent friends with Jason and candypop but sometimes he fights with them, but over stupid shit. He is usually by himself or tormenting Isaac so he doesn't have time for making more friends except his victims.
Where they live (+ who they share a room with if they live in the mansion) -
Isaac - he lives in the house he inherited from his parents, so far away from the mansion, in Germany. The way laughing jack gets to him is because the mansion isn't located anywhere, it's like part of the world but not at the same time, everything that exists there doesn't exist in the real world unless it has a way to get there like the pastas and hornets (MH).
Laughing jack - he lives in the mansion, he doesn't have his own bedroom, just a room with a jack in the box and clown figures. He doesn't necessarily sleep so he doesn't have a bed, he also doesn't share with anyone.
Free time hobbies -
Isaac - hunting others, or running away from police. Usually he does this while being tormented by jack.
Laughing jack - offering the children in the mansion sweets (or candy if you are american), tormenting Isaac or pretending to be a child's imaginary friend just to then kill them.
Fav foods -
Isaac - beef stew which a side of beer, nothing much but packed with flavours.
Laughing jack - sweets (candy), or children. Bro is weird idk but personally sweets are too much- and children- no- just no-
Fav place to hang -
Isaac - by himself in his house, trying to drown out laughing jack by listening to music
Laughing jack - in his jack in a box or in isaacs house, being a pain in the ass like always.
Extra information -
Isaac - he was supposed to go into a mental hospital after his parents death but when he was being searched for, laughing jack took him and hid him so he wouldn't be taken away. It is the only thing Isaac is grateful for from laughing jack. Otherwise he wouldn't tolerate him still.
Laughing jack - He has known Jason since he (Jason) was 18, watching him from afar but after finding out he would become a pasta, laughing jack backed off slightly, making sure Jason wouldn't know him when he gets there (so he stays away, still didn't happen cause he didn't know they would both be in the circus themed pastas instead of the proxies.)

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"Twisted Minds: Headcanons of Creepypasta and Marble Hornets"
FanfictionHeadcanons on each character in marble hornets and creepypasta but only the ones i know about, except slender and zalgo because of the fact the headcanons i have is the canon ones. Especially them being massive dickheads. This was made because i was...