In Part III, Leite's role in the story is expanded from a virtual background character to an important member of the supporting cast. She is married to Makken, who she affectionately calls "Oto-chan" or "Daddy", and the two have three children. Leite and Makken operate a small business servicing mechanical equipment and automotive vehicles, though on occasion they get contracts to develop weapons from the New Government. She and Makken have great faith in Simon and his capacity as a decision maker; their loyalty to him urges them to resist Rossiu by rebuilding the scrapped Gunmen of Team Dai-Gurren, refitting them with spiral weaponry capable of damaging Mugann. Leite also refits Gurren Lagann's power pack to allow it to reach escape velocity, but opts out of the Battle of Earth to stay with her children on the surface. When Team Dai-Gurren is reformed, she assumes her old post as engineer of the gang's flagship, the Super Galaxy Dai-Gurren. She eventually ends up as one of the fourteen pilots of Tengen Toppa Gurren-Lagann, battling Grand Zamboa to both avenge Makken's death at the hands of Anti-Spiral Kantai and for the freedom of the entire galaxy.