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Top
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Exdeath Can block counter almost any attack in the game, there are quite a few characters that have 0 moves that'll pierce ALL Guard and even the characters that do have a move that'll pierce it only have 1 or 2, leaving anyone facing him with horribly limited options
Tidus Fast, His attacks incorporate dodging and almost all link to HP attacks, He has hard to punish HP attacks in the air with good tracking, He has a decent ranged attack, and his ExMode makes him a mage killer
Golbez his HP attacks that have some of the best offensive and defensive properties in the game, BP attacks that can still hit on block or whiff, he has ability to cover a huge amount of range, and he can combo into HP attacks
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High
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Kuja His BP game is safe, he has range, and his HP game if versatile and very solid offensively, Flare Star's tracking and hit box is just insane in some cases
Zidane Fast, good HP attacks that are bother versatile in properties and range covering all the major points, most BP attacks link to HP attacks, and he has a few attacks that are a pain to block on reaction
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Mid
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Jecht Awesome melee damage, Jecht block is one of the best defensive techniques in the game (it's only really second to All Guard), and his combos are brutal, but he lacks a ranged attack of any sort
Ultimecia All her BP attacks are chargeable and can punish people who attempt to block early, Knight Sword is cancelable if it whiffs and absolutely brutal close range, Knight axe/arrow also give her options vs long range characters, on top of that apocalypse is the best anti-air HP attack in the game
Firion Mage in the air, Melee on the ground, both solid with his magic having both short cast time and range and his Melee all linking into HP and having good range as well as other useful properties, and his barrier counter can also be used for some rather brutal strategies
Terra Meteor is ace in the hole, the attack can hit your enemy anywhere and gives you an opening to do a variety of other attacks, Meteor -> Holy Combo -> Ultima hits hard, on top of that Tornado is a good close range punisher and blizzard combo is a solid keep away move
Shantotto Her traps and ability to build BP make her awesome, her huge cool down if she misses and her lack of any notable melee is a huge negative though
Bartz Very solid BP and HP game (he has quite a few of the better moves other characters do), his attacks give him accessory properties, and Goblin Punch is a great way to guarantee an ExBurst or some HP damage. His only major flaw is the lack of a really consistent method of HP damage against some characters
Cloud of Darkness Good HP attacks, BP attacks work well offensively and defensively, If it wasn't for her start up on a lot of attacks she'd be a lot better
Cecil DK mode can combo into basically any ground attack from Dark Cannon and Paladin mode is able to link to Paladin force from searchlight as well as having some solid BP attacks with good tracking
Cloud He has some solid punishers (Climhazzard/Braver), a really good ExMode, and the ability to pump out quite a bit of damage in one attack (Climhazzard -> Slash Blow -> Omni V5), but he lacks safe BP options, and a majority of his BP attacks are blockable on reaction which relegates him to a really high risk/reward style of play
Gabranth Normal Gabranth is below par in almost all respect while ExMode Gabranth can be absolutely brutal, as a whole character he's a solid mid
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Low
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Squall Simply put, he is BP rape but he can't follow it with HP attacks well, His Ex mode is one of the best in the game giving him better range, more criticals and 2x the hits
Onion Knight His magic is really bad outside of ExMode and his Melee is pretty short range and predicatable, his true saving graces are his ability to link all his attacks to either BP or HP and his speed
Garland Decent mid range game with his HP attacks and ranged Melee, good normal melee BP damage due to his high attack stats, and solid HP attacks (Tornado + Blaze), he lacks speed, BP -> HP combos, and any truly good HP punishers
Warrior of Light Weak ranged game, absolutely average BP game, and some solid HP attacks, his only true quality that keeps him above bottom are his protective HP attack and his ability to link to HP attacks
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Bottom
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Sephiroth Best melee range in the game and an awesome EX builder, but his EX mode is one of the most generally "meh" in the game and his HP attacks are a ***** to hit with
Emperor Good use of Lightning Crest and Flare can make the emperor a ***** to hit and punish mistakes severely. His major flaw is a weakness to really fast characters that can avoid both techniques like Tidus and Zidaine and his really weak air game.
Kefka his magic his harder to dodge than some mages but he requires constant attacking and predictive play to hit good players, ExMode makes up for it a bit by making his attacks considerably harder to dodge but even so quite a few of his magics can be reflected/deflect via dashing