I have this headcanon that Izaya is allergic to EVERYTHING—peanuts, wheat, corn, lactose, you name it (except shellfish, I feel like he eats that all the time). What’s fun about this headcanon is that he drives Namie nuts with the outrageously small selection of food she can make in his house. And he’s always saying how he wants a particular dish and leaves Namie to figure out suitable food substitutes.
Allergy ridden!Izaya, yes please.
Let me teach you something…
We humans, just for ten minutes, can’t even wait that long!
Do whatever you want during class.