Dragon Quest Monsters: Caravan Heart2003

Dragon Quest Monsters: Caravan Heart acts as a prequel to Dragon Quest 7 and was never released outside of Japan but there is a fan-translation patch.

You play Kiefer from Dragon Quest VII who ends up in the world of Dragon Quest II. You can use a group of 3 people or monsters to fight but enemies can show up in larger numbers. There is a job system for human characters with 20 classes.