Several years ago Tio's added a "vegan cheese" option to their menu which makes Tio's (as far as I can see) the most vegan-friendly restaurant on the University of South Carolina campus.
I've eaten at Tio's number of times. I eat there often when I am on campus and leaving for lunch is not an option. I usually order the (rather hefty) "Veggie DELUXE Wet Burrito with vegan cheese." The burrito is stuffed with rice, vegetarian refried beans, bell pepper, onion, tomato, cucumber, and fresh avocado (which is sometimes inside the burrito, and sometimes on top). The burrito is topped with a red tomato sauce, and there's usually some sort of iceberg chopped lettuce on the plate. With the burrito, you can also choose a salsa to go with it - from mild to extra hot. I think the extra hot salsa is quite good.
Although Tio's is not a vegan restaurant by any means, it is a vegan-friendly spot on a rather vegan-unfriendly campus. Feel free to check it out!Pros: Vegan-friendly, Polite and speedy staff, Free parking
Cons: Meat-heavy menu, Sometimes busy at lunch time