I loved this game. Made me almost cried at the end (if you beat the game, you know what I mean.) Anyway, Final Fantasy X is about a summoner named Yuna and her quest to destroy a mysterious force known as "Sin". You have to guide the main character Tidus through the many events of the game. Here are the character's that guide and help Yuna during her quest :

A cheerful young teenager, the star blitzball player for the Zanarkand Abes. He has long resented his father, a renowned blitzball player who disapeared during Tidus's youth. Tidus's quick moves allow him to attack even the swiftest foes with ease.

He's a captain of the Biltzball team, he plans to retire from the sport after this year's tournament so that he can devote himself entirely as Yuna's guardian. His deadly  blitzball is especially useful for shooting down aerial enemies.

Her experience and wisdom are valuble to the party. She treats Yuna as though she were her younger sister. Although she may seem insensitive at times, there are depths to her emotions that only her closest friends can understand.

The legendary guardian who accompanied High Summoner Braska on the pilgrimage to defeat Sin ten years ago. Auron guides Yuna and Tidus on their mission to vanquish Sin once more. He swings his gigantic sword with such power that even the toughest fiends are cut asunder.

A young warrior of the Ronso tribe, Kimahri watched over Yuna during her early years. He is devoted to Yuna and serves her loyally as a guardian. Kimahri can learn the special attacks of ennemies with his Lancet ability.

A young Al Bhed girl that has a upheat and positive personality. She dismantles mechanical enemies with ease, and can steal items from enemies as well. When Rikku joins the party near the Moonflow, her technical expertise allows you to start customizing equipement by adding abilities to the open slots on weapons and armor.