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He wears only boxers and a sports bra to sleep.
Nearsighted but refuses to wear glasses. Has prescription contacts but hardly ever feels "the need" to put them in. Gets headaches from squinting.
One of the few times Dabi brought himself to the ER was when he ended up with blood poisoning from a burn he'd given himself on his shoulder. He realized how bad it was when he was climbing up a flight of stairs and his shoulder gave out. He refuses to talk about how he fell down the stairs afterwards.
Refuses to go on boats unless absolutely necessary. He went fishing once (dragged along by Natsuo with the reasoning of "just try it for a few hours, maybe you'll like it") and threw up over the side of the boat.
Tums™ make him nauseous.
He likes to eat vitamin gummies because it makes him feel like he's taking care of himself. His favorites are the yellow ones.
His favorite movie is Coraline. He's drawn to the idea of a perfect world on the other side of a door, and has often
Doesn't have a smoke detector in his apartment, and if he's staying somewhere for more than a night he'll disable the smoke detectors there.
He drives a motorcycle, but he'll also take Natsuo's Honda Civic when his brother is home and puts a handicap parking placard on the dash.
Broke a rib in a fight and it never healed properly.
BPD as high hell— in addition to that, he has depression, PTSD (obviously) and anxiety from his childhood. Not as anxious as an adult, but he was almost admitted to the hospital for a psychotic episode when he was 22.
Dabi got his tongue split on his 23rd birthday and has since trained himself to move each half independently. His only regret is that it wasn't split deeper.
He has a high alcohol tolerance. His favorite is whiskey, but when he wants to get really drunk he'll drink vodka. Grossed out by tequila ever since he heard something about it having a worm in it (can't remember where he heard it or how credible that is, but it stuck with him).
His lungs aren't the best because of excessive smoke inhalation and his throat was damaged in the fire, which gives his voice that rasping quality. He actually has vocal chord paralysis, which also doesn't help. If he does a lot of yelling/screaming his throat will be sore the next day and he'll wheeze a little when taking deep breaths.
Because he never finished his education, he doesn't know much about the sciences or complex math besides what he'd already learned and what he picked up on the streets. He's undeniably intelligent, but if asked about calculus or physics he can't answer.
His favorite number is 11. There's no reason for this.
Dabi cares a lot about his hair. Dye strips the hair of its essential oils, which made his hair look more spiky than fluffy— and that wasn't really his thing. He doesn't really care what he uses in his hair as long as it looks/feels good, so he'll buy whatever's cheapest that smells good. His favorite is charcoal and mint, but he can never remember the brand.
He's prone to getting heatstroke in the summers, since it gets so humid. Dry heat isn't as much of a problem.
When he's stressed, he uses a lighter to calm himself down. It's made of titanium, battered and looking worse for wear, but he's had it since childhood. Dabi likes to light it and then put it out over and over, or just hold it. He always has it with him.
Dabi's bisexual. He hasn't been in any official relationships with women, but he's relatively sure he'll get a girlfriend one day.
If he were in a band (or had enough time to properly learn), he'd be the bassist. Dabi picked it up when taking shelter from a rainstorm inside of a music shop and the man behind the counter offered to teach him a few riffs. He can't read sheet music and doesn't own a bass of his own, but he was inspired by the bassist from the band Gorillaz and can play a few of their songs— only the bassline, of course.
He knows both Japanese and English, with Japanese being his first language. He struggles with the "th" sound in English.
His celebrity crush is Mirko, but he finds Hawks attractive too. He hasn't wanted to give his opinion on Endeavor yet. Out of the UA teachers, he's particularly interested in Aizawa and Midnight.
After years of eating instant ramen, he's sick of it and will go out of his way to make himself "actual" ramen when offered the instant kind at someone else's place.
Dabi has nipple and Jacob's ladder piercings in addition to his nose and ear piercings.
This shouldn't even be a headcanon, but he's dedicated to taking care of himself. Showers daily (if he can), replaces his staples to avoid infection, brushes his teeth, etc. With his scars making him vulnerable to infection, it would've be a miracle that he'd survived until adulthood without taking care of his health. He wouldn't be able to fight Endeavor if he wasn't in good physical shape, which is motivation enough for him to keep himself healthy.