Ni no Kuni: Wrath of the White Witch - Familiars

Familiars are your main fighting force in Wrath of the White Witch, as your characters won't be able to fight just by themselves. Each Familiar is able to equip specific kinds of equipment (like Mitey can only equip Blades), as well as learn new skills as they level up. You can get new ones from the wild, and can only have a choice of three to use in battle. They can evolve once they level up enough and you have a specific item.