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hi i propose the idea that tomura likes to unravel bows and knots. if there's a pretty pink bow (or any bow he ain't picky) he's def tugging at the ends and then he'll fix it again only to undo it again and it repeats until eventually he slips up and decays everything. his long nails help him unravel the tightest knots and he doesn't admit it but he gets this small feeling of pride whenever he manages to do so. also, he gets frustrated when the knot is just way too tight - he ends up crushing (decaying) the damned bow in his hands with a terrifying glare like it owed him something
he also gets mad when he finds out the ribbon bow he's been eyeing from afar is actually all hot glued together instead of tied. if such a thing happens in a store or sumn, best believe he's decaying the whole store while muttering grumbles - after he tells the others to steal whatever they want first, of course.