A few random headcanons about Attack on Titan characters that make sense in my mind (even if some are truly random idk):
Levi – In terms of his personal appearance and grooming, we can say that he is canonically very attentive to it. I picture him being very meticulous when it comes to his nails and especially shaving his face. In his free time, he still visits the Underground and brings basic necessities to children and families. On the Surface, he always helps, if he can, homeless people. After the war and once he became a retired veteran, he began to smoke even though it repulsed him. It was, however, a great way to calm his nerves.
Erwin — There were stray cats wandering around the backyard of the headquarters and he fed them regularly, to the point they started to settle there and became a feline colony. Hange, Moblit and Miche may have or have not helped him. A man that every single woman wanted to marry, or would have wanted as a son-in-law. He was tempted to let his facial hair grow, when he let it grow after he lost an arm, but at the end decided against it.
Moblit — He always reminded me of Armin, and just like him, he would probably spend hours inside the library to read while drinking tea. A very calm and quiet guy, well liked by the ladies as well, though he never felt like they would be interested in him. A morning guy who would like bread with butter and cherry jam for breakfast.
Hange — Has read "The Metamorphosis" by Kafka and asked themselves for weeks if the protagonist was a big roach or a small roach. Sleep talks, learned how to fix things by themselves even though it would end up with them having at least one small cut. Likes spicy food but regrets eating it every single time.
Miche — Very much into trekking, walking in the countryside, camping and all that stuff. Cooking meat on a fire in the middle of a forest, fishing with bare hands, hunting but only to feed himself. I can see that he's one who would build a birdhouse and replenish it with food periodically.
Nanaba — At least two Scouts told her that she was the perfect combination of Erwin (she's blonde with blue eyes) and Levi (her haircut and features). A big flirt with women, if a man is annoying a lady at the tavern she would step up no matter if the said guy is twice her size.
Oluo — His haircut is clearly an attempt to copy Levi's own. He said, to himself, "Nanaba has a similar one, I can do it" and ended up with... that. He also tried to hold teacups like Levi does, but they slipped from his fingers. He broke three of them in the span of a few weeks.
Petra — Massive dog lover, especially those small chihuahuas with big ears and a fluffy body. If Birkenstock were a thing in Paradis, she would've owned a green pair.
Pyxis — As a young man, he had tons of women around him. A flirt but not to the point he would cheat on his wife (since he's canonically married). And when he still had hair on his head, he was clearly blonde.
Keith Shadis — A massive Jägerbomb and Jägermeister drinker. He smoked cigars to unwind as he took breaks from his paperwork, and since he didn't want his subordinates to know that he smoked, he blamed that it was someone else smoking near him. Also–stay with me on this, he gives me massive Egyptian vibes. If he was from outside the walls, that is.
Nile Dok — He has the aura of someone who despite living in Karanes, he faked a posh accent at some point so people wouldn't say that he was from that part of Wall Rose. Having a wife and daughters, he understood women pretty well but would say "Yeah, and I have a bi-cycle" when Marie would get her period. You got that? Marie had her cycle and Nile had a bi-cycle... dad jokes would be his thing
Dhalis Zachary — Remember that chair of his? He probably would enjoy splatter horror movies. The human centipede
Theo Magath — A guy who has a sweet tooth. Likes dark chocolate and butter biscuits with his black coffee. People at the Warriors Headquarters–Porco–bothered him to kill the cockroaches that entered the bathroom when summertime arrived.
General Calvi — An Italian surname, which makes me headcanon him as Italian. Picture him as "Saverio Giovanni Calvi" (I went with old Italian male names), and for his political party, he was a Marleyan who hated Eldians. I don't think I have to add anything else to this.
Niccolò — If we have to keep in mind that he was from Marley and hated Paradisians and Eldians, he reminds me of a person from Northern Italy that hates the South and calls them terroni uncultured and unmannered. In Paradis, after the war and after he realized he was no better than the islanders, taught himself how to cook the typical dishes, especially the venison that Sasha's father would hunt for his restaurant. Likes old Italian movies and he isn't fond of cooking dessert.
Reiner — Likes to water plans at the Warriors Headquarters and helps the staff members to clean up if he can. Takes sleeping drops and wanted to learn to play guitar, at some point. Despite the fact that people think he is in love with Historia, I think he loves her like gays love Lady Gaga.
Bring me the horizon Bertholdt — Tried to eat sand as a kid to see if it tasted like breadcrumbs. It didn't. He spent hours building a sandcastle until Porco destroyed it, along with his brother Marcel. Reiner helped him build it back, along with Pieck and an older Zeke. Likes to eat ice cream alone, at the park, and was a good student.
Annie — Liked to hit little boys as a kid, especially when they would tug on Pieck's hair and call her names. One day, she slapped a boy so hard, his glasses flew away. No, that wasn't Zeke.
Pieck — Massive caffeine addict, but she's now numb to it and can sleep even if she drinks four cups a day and gives her the shits. Likes nightgowns and always has well manicured fingernails.
Porco — One of those guys that act like big shots but a "your mama" joke is enough to shut them up. And whenever he teases someone and that person has a better comeback, he grumbles and leaves.
Zeke — If he has time, he helps the local animal shelters in Liberio. Has books about dinosaurs, and he was obsessed with them as a kid. Also a child who went to the supermarket and he put the products back in their place if other customers grabbed them and left in another spot–the label HAS to face him.
Sasha — As a Southern girlie, she knew every single folk dance and song, and she invited her friends at least once to the village festivals in Dauper.
Jean — When in season 4 we see him with facial hair and longer hair, it took him forever to grow them out. At some point, Connie teased him saying that he must've glued a rat on his head, and Jean slapped the back of his neck.
Connie — Sneaks out of his room to have a midnight snack but he's so loud, he wakes the entire headquarters up. Hange doesn't have the guts to send him back to bed, but Levi surely does. His real name? Constantine.
Armin — A guy that claims to love nature but the moment an insect lands on his shirt, he would pass out. Cockroaches, dragonflies, crickets, grasshoppers. You name it. But he likes bunnies–the reason why he never ate rabbit meat, if served. Politely declining and saying that it upsets his stomach. After the war, he embraced veganism or vegetarianism.
Mikasa — We know that she liked ice cream once she tried it in Marley, and I would say she likes black cherry one, lemon, vanilla and peach, but her weakness would be berries. Likes to take walks, alone, and if she goes to the cemetery to bring flowers to Sasha and she finds a tomb without flowers, she personally plucks a few and offers them to these poor souls.
Eren — He likes to go for walks by the sea, and he always carries bread with him to offer to the seagulls. When they pooped on his shirt, he got annoyed and stopped for a while. Also tried to throw stones and seashells at them to take revenge of that.
Historia — As a Queen, she tends to sleeps late. She doesn't care and she sleeps in, if she could. Still visits the orphanages, and once her daughter was old enough, she brought her to play with those kids to teach her inclusivity and equality.
Ymir — During her time as a Scout, she would be having massive fights with Oluo. She couldn't help it. She hated his ass, and if it wasn't for Historia, she would've beat him up. But she would find Nanaba to be bearable, and even Petra—as harmless as she was.
Yelena — Let me hold your hand when I say: her deep voice with a Russian accent. A woman who doesn't like to shave, a big and massive lesbian. If she didn't enlist in the Marleyan troops, she would've been a Marine.
Onyankopon — A true gentleman, ladies loved him in Marley. He's religious, but after the Rumbling, I feel like he lost his faith for a lot of reasons. Though, before the war, he was usually going to church every now and then and he did volunteer work.
Gabi — Have you seen the scene where she basically suplexed Falco? If she kicked or punched a few Marleyan soldiers that were calling her "midget", it wouldn't surprise me.
Falco — A good kid at school, always polite and respectful. The one who prevented Gabi from talking back to teachers, and even to Magath.
Onyankopon — Has an entire journal filled with labels of the teas he tries—but also herbal teas. He loves collecting and started as a child with coins and bottle caps. If he doesn't know what to say during a conversation, he would chuckle and go, "It's cold/hot today, isn't it?" even though it isn't. Plus, he gives me massive Englishman vibes—can't decide if he's a Londoner or from the North.
Willy Tybur — Has five kids, loves his wife but he slept around. 100%. Due to the influence he had in Marley and the fact that no one could go against him, if he left his illegitimate children, the women couldn't say anything about it.
Grisha Jaeger — Kept a journal where he scribbled his memories from Marley, so he wouldn't forget them. Also, bad at cooking. He tried once and almost burned the kitchen down.
Carla Jaeger — When she was a waitress, she always had the attention of both men and women. And since she wore lipstick, I can see that she would always be very fond of makeup. Complimenting the other women for their appearances–to flirt or not, that was up to one's interpretation.
Kenny Ackerman — If classic rock was a thing, he would've been a diehard fan of rock bands. He was a chain-smoker, liked to drink intense liquors and never got tipsy right away. Has a Southern accent, never been religious, but a fervid supporter of "the end justifies the means". When he became the legal guardian of Levi and he would soil the bed, he would walk out of the house to calm himself down and not yell at him.
Kuchel Ackerman — A woman that was very refined and elegant. I can see her having books about romance, with fantasy settings. She's the one who taught Levi how to properly handle his personal hygiene, a reason why his clients liked her–she was very well kept. She secretly smoked.
Furlan — A guy that attracted his fair share of ladies in the Underground. Always have a part of his food to Isabel, liked to brush her hair and retrieve knick-knacks she would like, and that she ended up losing.
Isabel — Another cat fan. She went around the Underground to feed the stray cats, and she had brought one back home, to the place she shared with Levi and Furlan. It didn't last much, due to Levi not liking cat hair around the place, but she secretly kept it in her room. They knew due to the smell of cat and the tiny mewls at night.
Hitch — One of the most liked girls in her branch of the Military Police. She had at least one date each week, dated a few guys. She also had a flirt with a girl, and she had to admit that it was something she couldn't ignore. Blunt and straightforward enough to be men's worst nightmare.
Floch — No surprise when we say that he would be a big misogynist. Preaching about women finding fulfillment if they got married and had kids. A guy who would laugh if your pet dies because "it's just a dog/cat/whatever it is", but he's a pathetic yearner if he falls in love. The thing is, more than half of the women he was interested in didn't give a damn about him.
Sorry if it's a bit too long and if I missed any character but I was bored and here's the result of that ★