Tsunami is a place I go to every once in a while because they have some decent veg options. My favorites are the agedashi tofu (I have gotten them to leave out the bonito flakes). I have also gotten the seared tofu entree, which I have always found quite good.
Beware that the miso soup contains bonito stock. If you're unsure, be sure to ask the staff.
I visited again recently, and noticed that they had added a small section to their sushi menu with vegetarian/vegan options, which made me really happy.