I like the idea of adding tension - upping the stats of a character. In xenoblade you built up tension by being in battle after battle more frequently (I think) and for successfully encouraging your teammates during battle. This is one-on-one, but perhaps having a unit next to you ups the tension (trying to protect them). Or having high tension ups some stats battle after battle (skill/luck, dodge) but fatigue drains a certain stat, like attack.
I like the idea of adding tension - upping the stats of a character. In xenoblade you built up tension by being in battle after battle more frequently (I think) and for successfully encouraging your teammates during battle. This is one-on-one, but perhaps having a unit next to you ups the tension (trying to protect them). Or having high tension ups some stats battle after battle (skill/luck, dodge) but fatigue drains a certain stat, like attack.