In Chain Chronicle, there are over 150 allies you can potentially recruit but they all fall under one of these type of classes:
Soldier (Red): Great offensive abilities, okay with defense. Can get picked off pretty easily by ranged units.
Knight (Blue): Great defensive abilities, okay with offensive. They come equipped with shields, so they take reduced damage from ranged magic and arrows.
Archer (Yellow): Can fire arrows from any distance at enemies in the same row as them.
Cleric (Green): Can’t attack at all, but instead heals nearby allies.
Wizard (Purple): Shoots ranged magic like the Archer does.