If using wooden skewers, soak in water for several hours or overnight so they don't burn.
Place the onion, zucchini, bell pepper, pineapple, and tofu pieces into a medium-large bowl. Coat with teriyaki sauce.
Coat a grill or grill pan with cooking oil and heat to medium. Carefully thread the veggies, tofu, and pineapple on the skewers. Place on the grill and cook for about 3 minutes per side, or until nice grill marks appear the the veggies are tender crisp. You can brush more of the sauce on the kabobs as they are grilling if desired. I like to serve these teriyaki veggie kabobs with rice and salad.
Notes
Feel free to switch up the veggies. I love whole crimini mushrooms and summer squash too.