I can tell you exactly what it's gonna look like.
Turok from and Seymour would be attacking from behind. Turok being close to action then Seymour. Seymour would basicly attack the other team and be a healer mainly to Fulgore that would be all out in battle taking care of projectile with his energy shield thing and doing some minor attack while never engaging in melee battle unless needed and if needed try to do a few melee attack and a grab to get away from melee range.
So turok would be mass damage on single unit.
Seymour mass damage on single/several unit and healer of basicly only Fulgore.
Fulgore the meat shield that is kinda invulnerable to range attack.

See ? Battle plan arnt harder to make it took me a sec to think of that and it wouldnt take me more to think of anything else. I never even played any of the game these char are in. The only thing that is harder is the ballancing and that would be extremly long just ask Raziel if it would be easy to balance team. It would already be hard with character from same game/serie. So how hard you think it would be from diff. game ? No matter what char you bring we basicly know all about them. It actualy is funny cause i built a whole strategy with 3 char i know only because of Zelaron Melee. So it isnt true that because they are from diff. game it's harder and needing more creativity.