Combine the soy sauce, rice wine vinegar, brown sugar, garlic, and ginger in a bowl or baking dish to make the teriyaki sauce marinade. Mix well and add the chicken legs.
Marinade the chicken legs overnight in the homemade teriyaki sauce, if possible.
When ready to cook, add the marinaded chicken legs, teriyaki sauce and broth into the Instant Pot.
Sprinkle in the peppers and secure the lid.
Select "manual" and increase time to 15 minutes.
Quick release and serve chicken with the peppers, rice, and a sprinkle of sesame seeds and green onions.