hm, if auron can get over 9999 without any Hp + 40/50% stuff, then I'd stick it on him... unless you have a particular reason for wanting Tidus with more HP (because he's stronger or whatever) then give it to him, and if you need to give him an HP boost, go for the 50%, no reason to go at it half heartedly... I basically just had mine level up, no HP boosts, I had a few auto-phoenix armors anyway, so I didn't need that, then I put on stuff like confuseproof and stoneproof... <shrug>