Note: Our Sanzu here is not the 'bonten' Sanzu. And this headcanons are only how I imagine him. Please enjoy.
I saw from wikihow that teenage Haru have a calm and quiet demeanor so...
- Silent cuddles. He won't initiate it but he'll hug you right back the moment you hugged him.
- he won't talk unless you ask him a question.
-Waits for you outside your school, hands in his pocket, eyes on the trees (or something that he could stare at)
-He won't bring you to any Toman meetings since it's pretty dangerous.
-He would let you rant, he just silently watches you as you throw some things on the floor, he tries to evade some of them.
-Would introduce you to Mucho if you three bumped into each other on the streets. He won't introduce you to any other members aside from him and Mikey.
-back hugs
-Would secretly fight or threaten the person who tries to harass or bully you. Mucho will come with him sometimes.
-there was one time where you were telling him about your day, while he was on his phone. You thought that he wasn't listening so you stopped talking and stared at him. But he just looked at you and said "Why did you stop?"
-He takes his mask off just to kiss you on your forehead.
-You would take his mask off when it's just the 2 of you
-You kiss him on the lips even though he still has his mask on sometimes
-He'll let you play with his hair. You sometimes style it (You mostly do pigtails and put hairclips with animal designs on his hair)
-Love language: holding hands. he would stand beside you, hold one of your hands, and put it in his pocket, then he'll intertwine both your hands and squeeze it. back hugs.
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next one would be Bonten Sanzu

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Tokyo Revengers [Oneshots, Headcanons, and Imagines]
FanfictionJust some things I can't get out of my Head.. ~Mostly Headcanons and imagines tho ~If ever you're going to make a Fanfiction of the headcanons or oneshots I made, please give credits to me... I don't own Tokyo Revengers, it is made and completely ow...