Thanks for the in-depth response powerneg, appreciate it. The game will have a relatively high visual fidelity, we're using unreal 3 for mobile and we've released a game with it before so characters should be fully actualised.
The issue I'm having is devising a system in which the Player's choice of party members affects their performance in combat. It's important for the characteristics of the party members to affect the player in some way. I guess I'm just interested in ideas for party members influencing their leader in some way.
I'm a fan of the "less is more approach", so it has to be just the right mechanic for us to add it to the prototype list.