Things in my house that would confuse Tomura Shigaraki:
Kale.
Mood Stabilizers - he'd know what they are but "why, that seems normal to me."
Shampoo, in bar form
Anything for periods - I don't doubt he knows what a period is, he has the internet. However, given that his education came from Kurogiri and AFO I'd imagine they left some things out and he'd end up on said internet learning some very incorrect things about how people actually deal with them. I could see him staring at a bottle of Midol like "wait, that hurts???"
A plushie of him - okay, that would be a little awkward.
Sunlight, in a bedroom - annnnddd this got too sad and I'm gonna stop here.
edit: honorarily mentioning a cactus - "why do you like this thing, it's so prickly" stares at him.
