Among the many, many great JRPGs for the Playstation 2 are three great ones that are very unique. Mix an RPG with horror elements, humor, a unique battle system and general wierdness, and you have the Shadow Heart series:the original Shadow Hearts, Shadow Hearts Covenant and Shadow Hearts From the New World.
Shadow Hearts could be called a "spiritual successor" to Koudelka, a PS1 JRPG that was part survival horror, part RPG. I own and like the game, but it has some problems, not the least of which is that the developers put save points after, not before, major boss battles, leading to a lot of frustration. Shadow Hearts is a definate improvement, adding one of the best ideas in the form of the Judgement Ring.
Imagine a stylized clock face, only having one hand that spins around very quickly. In order to fight, use an item, or use magic in battle, you have to hit one or several pie shaped highlighted sections on the ring. Miss one or more and you lose your turn (in attacking, if you do miss one of three sections, you still get to attack, you just don't get as many hits in.) In addtion, there are tiny slivers of red on the judgement ring that, when hit, cause more hit or magic damage, or in the case of healing spells or items, more hit points back.
It takes a short time to get used to, but it's an awesome addition to standard turn based battles. And it's not a matter of fast reflexes, just a matter of getting the timing right. Instead of just hitting attack and targeting an enemy, you also use your own skill with the judgement ring to cause damage, making battles more interactive. Do you try to hit the red section to cause more damage, or lose your chance to attack?
Shadow Hearts Covenant brings this idea even further, in that you can link judgement ring attacks of different party characters. As long as you keep hitting the right spots, you can get a chain going and beat the crap out of a monster (almost all the enemies and bosses you face are monsters, which get weirder and more groteque.)
Add to this a main character in the first and second games who is a harmonizer, or a person who can transform into 20+ demons once he defeats them, each with their own special attacks. (In the third game, there is a character who can also transform into demon forms, except it is a she this time.) Other party characters throughout the series are a vampire wrestler, an old man named Gepetto who attacks with female dolls, a cat who knows martial arts, and a ninja names Frank. Told ya this series was weird.
The games also hit all the other marks:great graphics wonderful sound and engaging stories. I really can't recommend these games enough. I managed to find SHC and SHFtNW at Gamestop for reasonable prices, and found Shadow Hearts at Blockbuster. Amazon or Ebay are probably the best bet to find these wonderful games. I would probably buy a PS3 if they ever came out with a fourth gamein the series, but with JRPGs being in the state they are in, that will probably never happen. One can dream...