Anti-Spirals
When the Anti-Spirals begin their attack on the Earth once its human population reached one million, they used mecha that are evidence of the their superior technology ranging from actual mecha to virtual-based ones like the Mugann. Compared to the Gunmen and other earth-based mecha, the Anti-Spirals' mecha are each a giant in its right and follow a Hinduist-theme.
Read more about this topic: List Of Gurren Lagann Mecha