Super Tengen Toppa Gurren Lagann

Released only in the second movie of the series, titled Lagann-Hen, this form was the peak of the aforementioned Gurren Lagann forms.

Mecha
After Tengen Toppa Gurren Lagann had been destroyed by the Grand Zamboa, Team Dai-Gurren split it's power and pieces to form their own separate Tengen Toppa Gunmen, including Tengen Toppa Gurren Lagann's head becoming Tengen Toppa Lagann. The rest of said team was composed of a Tengen Toppa gunmen for all surviving members as well as Nia [Note that in the film, all members of Team Dai-Gurren who had died in the final battle other than Kittan had been spared]. Those who normally piloted Dai-Gurren in the first half of the series then worked together to pilot Tengen Toppa Dai-Gurren, which was essentially the body of Dai-Gurren added on top of Super-Galaxy Dai-Gurren with demonic features similar to Tengen Toppa Gurren Lagann, holding the nose of Dai-Gurren as a weapon in it's left hand and a Dai-Gurren flag made of spiral energy in the right. After a lengthy battle, Lordgenome sacrificed himself to create a mass of spiral energy, which Tengen Toppa Lagann split between the team and then used it to combine into Super Tengen Toppa Gurren Lagann. This form resembled a mass of spiral energy in the form of a faceless Kamina, the former pilot of Gurren, creator of the brigade, and Simon's 'brother', complete with crimson cape and glasses. Its size appears to be more than a hundred times larger than its preceding form (itself previously regarded as the largest mecha in fiction), with the Grand Zamboa and all the galaxies looking tiny in comparison.

Attacks
During the short battle involving this form, it's only notable attack was the powerful Super Tengen Toppa Giga Drill Breaker. Said attack, when collided with a similar and equal attack from the evolution of the Grand Zamboa, the Super Grand Zamboa, caused the very dimension the fight was held in to collapse on itself.