Megacrossover SI

[Seed00]

Ok, this is an Si where these two guys get sent to their first world being Maccross.

Poor guy got a rude awakening where he gets beaten up by the Earth forces. He ends up resenting UN Spacy and kills Isamu, stealing the YF-19 in the process.

Next stop is Ranma's world, where Ranma pretty much gets his own version of Xenogear's Id in his head, who happens to be his female self and tortures Akane who cheated pn him with Ryoga.

Ranma goes with the first dude in the YF-19

They then end up in the Gundam Wing world and basically screw up Treize's plan to take over. This results in the US declaring war against OZ.

The Yf-19 gets an upgrade and a twin beam canon from Dr.J

Proceed then to the Xenogears world.

Can anyone remember such a story?

[Bliss]

Sounds like Bud's Blended Dimensions: Self Inserts

[Seed00]

Yep, that's Bud's fic alright.