Agent is a nice option to throw a spanner in the works later in the game when you have a wide board of exerted characters

The Final Days Gaius van Baelsar Hecteyes Braska's Final Aeon (Jecht, Reluctant Guardian // Braska's Final Aeon) Jecht, Reluctant Guardian (Jecht, Reluctant Guardian // Braska's Final Aeon) Kain, Traitorous Dragoon Malboro Namazu Trader Ninja's Blades Overkill Phantom Train Poison the Waters Qutrub Forayer Reno and Rude Resentful Revelation Sephiroth, One-Winged Angel (Sephiroth, Fabled SOLDIER // Sephiroth, One-Winged Angel) Sephiroth, Fabled SOLDIER (Sephiroth, Fabled SOLDIER // Sephiroth, One-Winged Angel) Sephiroth's Intervention Shambling Cie'th Shinra Reinforcements Yiazmat, Ultimate Mark (Sidequest: Hunt the Mark // Yiazmat, Ultimate Mark) Sidequest: Hunt the Mark (Sidequest: Hunt the Mark // Yiazmat, Ultimate Mark) Summon: Anima Summon: Primal Odin Tonberry Undercity Dire Rat Vayne's Treachery Galian Beast (Vincent Valentine // Galian Beast) Vincent Valentine (Vincent Valentine // Galian Beast) Vincent's Limit Break Shinryu, Transcendent Rival (Zenos yae Galvus // Shinryu, Transcendent Rival) Zenos yae Galvus (Zenos yae Galvus // Shinryu, Transcendent Rival) Zodiark, Umbral God Barret Wallace Blazing Bomb Call the Mountain Chocobo Choco-Comet Ifrit, Warden of Inferno (Clive, Ifrit's Dominant // Ifrit, Warden of Inferno) Clive, Ifrit's Dominant (Clive, Ifrit's Dominant // Ifrit, Warden of Inferno) Coral Sword The Fire Crystal Fire Magic Firion, Wild Rose Warrior Freya Crescent Gilgamesh, Master-at-Arms Haste Magic Hill Gigas Item Shopkeep Laughing Mad Light of Judgment Mysidian Elder Nibelheim Aflame Opera Love Song Prompto Argentum Queen Brahne Random Encounter Raubahn, Bull of Ala Mhigo Red Mage's Rapier Sabotender Samurai's Katana Sandworm Seifer Almasy Self-Destruct World Champion, Celestial Weapon (Sidequest: Play Blitzball // World Champion, Celestial Weapon) Sidequest: Play Blitzball (Sidequest: Play Blitzball // World Champion, Celestial Weapon) Sorceress's Schemes Summon: Brynhildr Summon: Esper Ramuh Summon: G.F

It can easily help you move more than one character to a location at a time
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Shes not a defensive character, though - ability The Singing Sword means Cinderella, Stouthearted can dish out just as much as she takes, becoming able to challenge opponents ready characters on the same turn you play a song
9 Xantcha, Sleeper Agent One of the most unique, flavorful creatures Magic has seen, Xantcha breaks many fundamental rules of the game to dazzling effect