Co-op action games for teens on Switch let them team up with friends for epic battles. 'Diablo III: Eternal Collection' offers hack-and-slash gameplay, with four classes to choose from (Barbarian, Wizard, Monk, Demon Hunter) and loot-based progression, perfect for 2-4 players. 'Borderlands 3' brings chaotic first-person shooting, with unique character skills, a hilarious story, and tons of weapons, allowing 2-4 teens to explore the galaxy together. 'Monster Hunter Rise' lets teens hunt giant monsters with friends, crafting gear from loot to take on tougher foes, with a focus on strategy and teamwork. 'Torchlight II' is a colorful action-RPG with fast-paced combat, pet companions, and randomly generated dungeons, ideal for 2-4 players looking for non-stop action. 'Warhammer 40,000: Darktide' (port coming soon) is a co-op shooter where teens battle hordes of enemies in a dystopian future, with class-based roles and intense firefights.