How does one put FFX-2 above FFX in character work? FFX characters develop, have strong identifiable personalities, etc. FFX-2 characters do not. Rikku is just a hyperactive character with voice acting, Yuna is but a shade of her FFX self who has some major out of character moments (no, "Tidus rubbed off on her!" is not an excuse. If it was, we'd have seen more of that in FFX; Tidus helped broaden Yuna's viewpoint of life and removed her from the "Yay Yevon!" view point), and Paine is just Female Squall. She doesn't develop, has no real connections with characters, just exists to foil Rikku in the grand scheme of things.
And yes, Rikku was in character based off of FFX, I won't deny...the difference is, how she was handled. FFX, Tidus and Wakka compliment Rikku nicely, there's actual chemistry there. She doesn't have this with Yuna or Paine, which alone turns someone whose fun into someone whose annoying.
And no one in the FFX-2 cast is remotely comparable to Auron. Not saying Auron is the GREATEST THING EVER, but he's one of the stronger characters (developmentally speaking) in FFX. Yes, there's Leblanc for NPCs, but they're pretty much just a one joke wonder running gag.
And yeah, agreeing with CT on FF8. Squall and Rinoa are the only characters with a remote sense of development, be it good or bad. Quistis stops having ANY character work once you get out of Balamb Garden, Selphie's entire characterization is just "I'm on sugar!" The Trabia Garden thing SHOULD have been a moment to actually develop her and show off a more serious, calm side that's internal, but instead we get treated with the Orphanage. Irvine..."SNIPERS ARE A LONELY LIFE!" and then...uhh...what's he do after that? Oh right, PROVOKED THE ORPHANAGE SCENE!!! Zell has an identifiable personality, but geez if he's not meaningless. The Balamb sequence could have been a moment to show Zell's truly heroic, good qualities rather than the Hot Tempered blow hard, but instead, he's just forced there for the sake of consistency with plot ("Hey, this is my town, I want to make sure my folks are alright!")
The thing that FFX has going for it that FF8 doesn't either? Its love story actually kicks off early and progresses throughout. Say what you will about how good/bad it is, this is far superior to FF8's where Squall is doing his best to ignore Rinoa the ENTIRE GAME, even to the point of wanting to leave her for dead (not cause he hates her, but because there's far more pressing matters. This was actually a commendable leader decision seeing as THEY WERE FIGHTING A WAR. His friends just were being idealistic fuck-tards who were all "YOU MUST SAVE RINOA! SHE'S ONE OF US!"), and then EVERYTHING regarding Squall's development is THROWN AWAY for an out of character shift into "Rinoa's Love Sick Puppy" and she's unconscious for the majority of Disc 3, and some of the scenarios are ridiculous (RINOA IN SPACE!)
Now look at FFX. Yuna and Tidus hit it off almost immediately, and the game even shows the "love at first sight" thing with a tease line of "Hey, don't go getting any funny ideas, ya?" "No promises there big guy...but what if she comes onto me." At first, yeah, its more "Tidus is impressed by Yuna's talents, and wants to meet this hyped summoner", and Yuna is more intrigued by the Jecht factor, but...its clearly going into something stronger. When we hit the Make Out scene, there has been a lot of POSITIVE interaction between the two, such that when Tidus abruptly kisses her, she's fully willing to reciprocate because its what she wants as much as he does.
Furthermore, FFX doesn't take back seat to its Love Story, but is complimented by it. The game still stays on its main path, and the lovers are more just part of what goes on. Contrast this to FF8 where 75% of Disc 3 is "WE MUST SAVE RINOA!!!" That's literally it. This is not an exaggeration; the reason they go to Esthar is get Rinoa out of her coma. The reason they go into Space is to get Rinoa out of her coma. The reason Squall jumps out of the escape capsule like a moron? Rinoa. Reason they break into a high security prison of sorts meant to hold a Sorceress? Rinoa. The game does hurl a big lunar crisis at them, but in the end, until you actually get into Lunatic Pandora, just about everything is "Rinoa. Rinoa. Rinoa. Rinoa!" Yes, FFX has a lot of "Yuna. Yuna. Yuna. Yuna." but unlike Rinoa, Yuna is INTEGRAL TO THEIR SUCCESS. She's the Summoner, she's the key element. Rinoa is completely meaningless as a plot device in that regard until late Disc 3 where she's revealed to be a Sorceress.