Is Super Tengen Toppa Gurren Lagann actually Kamina? Viewers of the second movie are familiar with the gigantic mecha Super Tengen Toppa Gurren Lagann, the most powerful mecha that Team Dai-Gurren uses in the whole franchise. It bears a strong resemblance to Kamina, except with Simon's glasses and with no face. A number of sites note the resemblance, including the Gurren Lagann Wiki.

 

In some places it's claimed that Super Tengen Toppa Gurren Lagann is a reincarnation of Kamina, but none of them are very official, so this may just be fan speculation. Is there any evidence that Super Tengen Toppa Gurren Lagann is actually a reincarnation of Kamina, or do they just resemble each other?
I don't think there is any official source on this, but I would guess STTGL was made with image of Kamina in mind. Kamina was spiritual leader of Dai Gurren Dan and he was most influential person on all main characters, including Simon, Yoko, Viral and other. As that, they all see him as representation of power, freedom and determination. Fitting image for STTGL.

Also note, that at end of TTGL, it is said resurrection of dead people is (at least) morally wrong. So resurrecting Kamina, albeit temporarily, would go against believes of main characters.