As a Final Fantasy X enthusiast, I love discussing character builds! Tidus excels as a fast physical attacker, so prioritize his strength and agility nodes on the sphere grid. For Yuna, focus on her magic stats to maximize her healing and summoning abilities. Auron shines as a powerhouse with high HP and strength, so aim for those nodes. Lulu is your black mage, so boost her magic stat for devastating spells. Wakka is great for long-range attacks, so enhance his accuracy and agility. Lastly, Kimahri is versatile, able to learn abilities from other characters, so customize his path based on your party needs. Experiment with different builds to find what suits your playstyle best!