Necklace | Final Fantasy X | Tidus

Tidus (Tee-dus) is the main protagonist of Final Fantasy X. He has disheveled blond hair with spiky layers. His hair is brown in his childhood flashbacks. He wears the logo of his blitzball team, the Zanarkand Abes, as a silver pendant, and the logo is also printed on his right trouser-leg. 

He can be acquired as a Creature Creator ally in the International + Last Mission and HD versions of Final Fantasy X-2, and plays a pivotal role in the extended universe audio drama and novella.

He is a rising star blitzball player from Zanarkand, and the son of major blitzball star Jecht. After the gargantuan monster known as Sin attacks his hometown, Tidus is transported to the world of Spira. Lost, confused, and seemingly out of place, Tidus meets a newly-fledged summoner named Yuna, and her guardians. Yuna is to set out on a pilgrimage to put an end to Sin, and by joining Yuna on her pilgrimage, Tidus hopes he will find his way home.

(from Final Fantasy Wiki)