Obi-Wan loves reading. He used to do it all the time when he was in the crèche waiting to be chosen. It doesn't really matter what it is. Non-fiction, fiction. Histories of different planets and cultures, the ecosystems and biologies creatures, and novels of all sorts. Mysteries, romances, fantasies, mythologies. You name it, he'll read it. And he will talk to you about it.
He and Anakin have an unspoken agreement that if he listens to his padwan's explanations of mechanics, robotics, and ships, he will endure Obi-Wanâs long-winded book rants.
The reason Jocasta Nu talked back to him in Attack of the Clones was because he was terrible with returning things from the Archives. Drove her nuts his entire childhood. He's better about it once he's been Knighted, but she still gives him as much sass as he gives everyone else.
He is mistaken that drinks substitute as food. If you ask him what he's had today, he'll tell you a cup of caf, several cups of tea, maybe even a can of fizz (soda) or an energy drink. When you ask him what he's had to eat he'll kind of just stare at you before admitting he doesn't rightly know. But oh well! At least he's hydrated! (Cody, Helix, Kix, and Ahsoka are waiting for you to leave before giving him a talking to.)
Everytime he sends a text, his grammar is immaculate. No misspellings, perfect punctuation. He still uses emojis (albeit sparingly,) and sometimes will use more exclamation points or question marks than necessary, but other than that, he writes like an A+ student writing an essay for English. (Anakin and Ahsoka make fun of him for it.)
I could definitely see him as a Hozier fan, as well as Keane and Coldplay. Also, seventies pop. Elton John, ABBA, the like.
Animal-lover. This is actually one thing he and Qui-Gon had in common. The day he tried sneaking a stray tooka into their rooms, his master just chuckled and helped him give it a proper bath. (The only reason they didn't keep her is because she ended up being pregnant and they couldn't take care of all the babies or stand to seperate them from their mother. The Master and Padawan took them to a shelter and they both cried on the way back to the Temple.)
Sweet tooth. But like, in very specific way?? He likes things with chocolate, and he puts lots of sugar into his tea. But he gets his caf black? And snacks on lemon peel gummies? Anakin is appalled everytime they go to a cafshop, because the barista will give them weird looks no matter what. Whether his master asks for seven sugars in his cup of tea or seven shots of espresso and nothing else. There's no escape.
He and Quinlan both got matching tattoos when they were younger. They are the best friends ever and they thought it'd be cool. Tholme had a mini freak-out when he learned they got it done and didn't tell anyone beforehand. (Only because he was worried it'd get infected.) Qui-Gon didn't care because he knew Obi-Wan would do his research and find someplace with a good reputation. (And sanitary tools.)
Quinlan was there for Obi-Wan in the early days of Anakin's padawanship, helping him to mourn properly and also helping him take care of the hyperactive nine-year-old under his charge. (Aayla was also a huge help.)
Good with languages. Not only learning it, but adapting to different dialects and accents after he has time to listen. His Mando'a is immaculate, and he definitely scares some troopers who thought no one would be listening when he joins in on their conversation. (This is hilarious for him.)
Obi-Wan runs cold. He drops his robes to be dramatic and cool, and then pouts when he gets chills after the fight is over. (Cody finds this annoying, hilarious, and adorable all at the same time.)
When Anakin was younger, they would always huddle up in their quarters because they were both freezing. This tradition continues even as they get older. They grab blankets, snacks, warm drinks, and watch holos in a little blanket nest on their couch. Even though Ahsoka runs extremely hot, she joins in just for the fun of it.
While Dooku was still a Jedi, youngling Obi-Wan followed him around like a shadow. Hid in his cape, pulled on it to get his attention, asked for uppies. Dooku pretended to be disgusted and over it, but when no one was looking, he indulged the small child. Yoda had the next addition to their lineage planned from that moment on.