Okay, here we go:
1. Freedan (Illusion of Gaia)
2. Link (Legend of Zelda)
3. Cecil (Final Fantasy IV)
4. Rydia (Final Fantasy IV)
5. Shadow (Illusion of Gaia)
6. Mario (Super Mario RPG)
7. Bowser (Super Mario RPG). Okay, for this, I'm basing it of the whole "If they join your party" thing, as Bowser does in Super Mario RPG. If this doesn't work, I'll replace him.
8. Geno (Super Mario RPG)
9. Soma (Castlevania: Aria/Dawn of Sorrow)
10. Samus (Metroid)
11. Kirby (Kirby)
12. Sora (Kingdom Hearts)
13. Knuckles (Sonic)
14. Cyber Ninja (Metal Gear Solid)
15. Master Chief (Halo) [is shot]
16. Crono (Chrono Trigger)
17. Death's Hand (Jade Empire)
If I think of anymore, I'll add them. If none work, or you need more info on them, just let me know.
