Numbers are HP, parentheses are basic positioning on the Sphere Grid:
Tidus: 3120 (roughly thirteen moves from Quick Hit, though I can skip a lock to get there faster)
Yuna: 1875 (just returned from Auto-Life to get Regen)
Auron: 5071 (recently got Entrust and is now following Tidus's path to Slow)
Lulu: 2980 (just got Doublecast)
Wakka: 4218 (two moves away from Triple Foul)
Kimahri: 3244 (ten moves from Flare)
Rikku: 2560 (eight moves away from Full-Life, though I would need at least one more Level 4 Keysphere)
I have at least three spheres waiting to be used for all of them outside of Kimarhi and Rikku (both at zero), though I don't plan to use them until I better learn some of these enemies first and perhaps get more special spheres; a Tonberry gave me a Teleport Sphere, for example, and I'd certainly like some more like that!
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Nominate E P O N A.