The Universe is really big

Dang, I was watching through that animation as I was about to post this, and I see the idea was taken but this picture also excellently gets the point across.

 Spoiler

Tengen Toppa Gurren Lagann: so insanely big, that it and the uber Anti Spiral mech start throwing friggin' galaxies that seem absolutely miniscule in comparison to them at each other.

Being the science hoar I am: How big is he? No, hush you pervs. From the scale, it looks like there would be a significant delay in light traveling from his head to feet, let alone a functioning nervous system. How fast does he move? The force to move something that massive... ;-;