Tengen Toppa Gurren Lagann

Tengen Toppa Gurren Lagann is the titular mecha of Gurren Lagann. In the TV Series, it is the strongest mecha, however, the movies give that title to the Super Tengen Toppa Gurren Lagann

History
By combining his own Spiral Energy with his comrades', Simon created the ultimate entity, the titular Tengen Toppa Gurren Lagann (literally means "Heaven-Piercing Gurren Lagann") in the final battle against the Anti-Spirals. Not actually a mecha at all, it a mass of materialized Spiral Energy on the scale of a galaxy. Though being similar to the Gurren Lagann, its design is overall very different from other mecha in the series, its armor being made up of red skulls bound together by Spiral Energy that burns continuously from its core, giving it the appearance of Team Dai-Gurren's emblem. Each of its many faces has one cockpit containing: Simon and Nia being the head, Viral the torso and the rest of Team Dai-Gurren in the limbs and joints placed in Lagann-style cockpits. Its abdominal mouth is clenched onto the head of the Lazengann, containing a fully resurrected Lordgenome. It has been confirmed in the data books that the Tengen Toppa Gurren Lagann is 10 million light years in height. This makes it roughly one hundred times the size of the Milky Way Galaxy, and also makes it the largest mecha seen in anime to date.

Tengen Toppa Gurren Lagann draws jointly on abilities from its many pilots, including Simon's drills, Yoko's rifle, Viral's swords and so on. The actual limit of the mecha's abilities is immeasurable, as it gains an infinite amount of power depending on the pilots' will to win. At points, Tengen Toppa Gurren Lagann and the Anti-Spirals' Grand Zamboa fight at forces equal to the Big Bang, the battle being so intense it was shown to rip holes through various dimensions showing that the power of each was on a God-like scale. This is furthered by the fact that they can alter the fundamental laws of reality, such as altering probability and creating matter out of thin air (which is no small feat even by the series' own standard, as the various drills and weapons materialized are larger than most small galaxies).

Trivia

 * Tengen Toppa Gurren Lagann bears a striking resemblance to Super Robot Wars/Taisen Original Generation's Persoenlichkeit. It is quite possible that Tengen Toppa Gurren Lagann is based of Persoenlichkeit, due to the reason that Gainax also participated in many productions of Super Robot Wars/Taisen.