My favorite characters are Kimahri and Lulu Kimahri because he's a mix between Dragoon and Blue Mage, my 2 favorite FF jobs, and I just generally love his design. And Lulu because of her design and her personality, I feel like she's the character I can relate to most.

But the best for damage output is probably Wakka.

Wakka, Yuna and Auron seem to be the best 3 characters in endgame for me.