These teams are in the same time parties, just like in RPG games, because each character can advance through levels by gaining experience and improving qualities like health point, armor, damage, range. These values can be considerably increased by using artifacts they wear. As sometimes I could transfer just a limited number of troops from one mission to another I did my best no to lose units and this proved to be really useful later. All these and also the fact that characters have names contribute to their individualization and to the increase of player's attachment to them, just like in a pure RPG.