Combine pork, soy sauce, rice wine vinegar, brown sugar, sesame oil, lime juice, Sriracha, ginger, and garlic in a large resealable plastic bag. Squeeze out excess air and seal the bag; shake to combine and coat pork with marinade. Marinate in the refrigerator for 1 hour, turning occasionally.
While pork is marinating, soak skewers in water for about 20 minutes; that will help keep skewers from burning while grilling.
Preheat an outdoor grill or indoor grill pan to medium-high heat and lightly grease the grate with oil.
Meanwhile, thread skewers, alternating with marinated pork, pineapple, and bell pepper pieces; discard marinade.
Cook on the preheated grill until grill marks appear and pork is no longer pink, about 2 minutes per side. Garnish with green onions and sesame seeds.
