Mobile Ops: The One Year War contains 18 characters (playable mobile suits) from both the Federation and Zeon.
The game is unique in that it is actually a first-person shooter (although you can also switch to third-person) that features not only FPS action but also online play and vehicles. The game has yet to be announced for anywhere outside Japan and was released there last year for Xbox 360.
Here’s the official synopsis
The story of “Mobile Ops: The One Year War” opens with the space colonists’ brutal battle for independence from The Earth Federation. Advanced ECM (Electronic Countermeasures) has rendered range sensors and communications useless, resulting in the rise of new war machines called mobile suits. These ultimate instruments of destruction, capable of metal-clashing hand-to-hand combat, completely redefine modern warfare.
Playable Federation Mobile Suits:
1. RGM-79 GM
2. RGM-79(G) GM Ground Type
3. RGM-79SC GM Sniper Custom
4. RX-75 Guntank
5. RX-77 Guncannon
6. RX-79(G) Gundam Ground Type
7. RX-79(G)Ez8 Gundam Ez8
8. RX-78-2 Gundam
Playable Zeon Mobile Suits:
9. MS-05B Zaku I
10. MS-06J Zaku II Ground Type
11. MS-06S Zaku II Char Custom
12. MS-06FZ Zaku II Kai
13. MSM-07 Z’Gok
14. MSM-10 Zock
15. MS-07B Gouf
16. MS-09 Dom
17. MS-14 Gelgoog
18. MS-14S Gelgoog Char Custom