@ Eratas: Hm, let me acces my inner crack!
Meditation position*
Hmmmmmmmmmmmm...
Muv Luv IS version with BETA invasion? If you don't know what it is, please wiki it.
Knowing you guys though, you probably have cooked it up already...
What about a megacrossover? Tabane invents a dimension hopping machine, something goes wrong, and every single protagonist in every alternate universe gets swapped with themselves of another dimension?
And so, a Death Note wielding Irish, a Soul Reaper/Shinigami (if you favor that iteration) Kyuukai, and a guntoting Orimura X of Liberty City show up on the academy...
...
While normal Irish is sent to where you fancy, Kyuukai is sent to Heaven- I mean, the Dog Days universe, and Ichika lands in a bathroom stall... On a certain spaceship called the Archangel as it heads to battle with an organization named ZAFT...
...
My inner crack, you never cease to fail me.