Ultimate Interchangeable Fighters, or Ultimate Fighters, are a series of Ships in the R-Series. The be-all-end-all R-Series fighters developed for Operation: Last Dance, the coup de grace on the Bydo, and the best the Earth Space Corps has to offer, they can utilize any Force, any Bit Device, any Missile and any Wave Cannon for their offensive loadout.

List of Ultimate Fighters

• R-99 Last Dancer
• R-100 Curtain Call
• R-101 Grand Finale

Backer-exclusive Ultimate Fighters

• R-9uso801 April Fools II
• R-99X Requiem
• R-GS9sp Last Gigs

Notes

• The Ultimate Fighters cannot change their Delta Weapon and also unlike OF Series the speed change option cannot produce damaging backblast.