Bubu Mumu is a model vendor NPC at the Ninjago Monastery. His cousin, Craven Jules, can get a great deal on Onyx Gems, and he sends players into the Ninjago Cave to retrieve some. Later, when Cringe Lo fails to show up for work, he asks players to find him. Cringe writes a love note to Nya, and when she rejects him, he asks players to tell Bubu he's quit his job. Bubu knows Cringe well, and furious, he tells them that he will likely have headed to the Ninjago Caves. He sends them to find and save Cringe. Although succeeding, Cringe does not rejoin Bubu.