Double Cast, Mug, Lancet, Copycat... they're all FFX abilities we're familiar with and we can probably relate one character to more than any other. However, they're not the "final" ability of any character's sphere grid. Personally, I find it interesting that each character has one final ability that is specific to them. An ability that was chosen to represent all that they are. I will list each character's final ability below... tell me what you think Square-Enix meant to each to represent for their respective characters.
Tidus - Quick Hit
Wakka - Triple Foul
Auron - Entrust
Kimahri - Scan
Lulu - Flare
Yuna - Holy
Rikku - Bribe
Tidus - Quick Hit
Wakka - Triple Foul
Auron - Entrust
Kimahri - Scan
Lulu - Flare
Yuna - Holy
Rikku - Bribe