Usually seen with magic cards floating overhead, Ace is hanging out at a chocobo stable. In battle, Ace can throw cards at enemies, which can be done at close range or from a distance. One of his abilities is "Deck Open" which makes Ace draw four cards. Depending on what cards he draws you may damage an enemy or recover characters in your party.
Queen is armed with a saber (specifically a Mythril Saber in the screenshots) and this weapon lets her easily chain attacks. Her "Cross" ability hits enemies in a line.
Nine is the dragoon of the group. He uses a lance, which gives him a spin attack that hits enemies further away. "Jump" is one of Nine’s abilities and this skill sends Lance crashing down on enemies from the sky. In Final Fantasy Type-0, Jump has an area of effect and can hit nearby enemies on top of a target.
More screenshots of the three warriors and their tonberry summoning teacher Kurasame follow.