[quote=@DarkRecon]
If you must know, some of the choices I had in mind were Ryu from street fighter, Mercy from Overwatch, Robin from Fire Emblem Awakening and Hawke from the Advance Wars series. There were more believe it or not -__-' but I felt these were the main four I had thought about doing.
[/quote]

Definitely all unique characters.

Ryu would be a nice Street Fighter representative. Pretty good brawler and all~

Mercy would be a valuable healer, however she would also have to heavily on her teammates to support her against the enemy. 

Robin would be a powerful magical warrior - god help us all if Grima ever wants to show up.

Hawke/Maverick could be a cool badguy unit-commander, revolving more on minions and units to help him conquer. However, we're pretty full on major villains atm, so I dunno about him personally. 

I think your two best starting bets would either be Ryu and/or Robin.