How about...
The Archangel's Amazing Adventures by CSS.Stravag.
Gundam SEED/Magic Knight Rayearth
The Archangel and the Creuset Team, from Gundam SEED, get sucked to Cephiro along with the Magic Knights. It's weird, really weird, but also... fairly plausible (to a point) and pretty damn funny at times.
It's actually a multicross in progress; the next stop is the Battletech universe... along with the MKR trio and their Mashins.
It starts right after the Archangel leaves Aube in the original series, when the Creuset Team attacks and the Blitz gets disarmed (litterally), so Kira and Athrun are still at odds (Nicol ain't dead) and Kira doesn't have the God-Mode Freedom/Strike-Freedom yet.