Playstation 2 has the biggest (J)RPG collection, however to enjoy these mostly you might want to get undubs and translation patches (or unoffical translations) since localizations tends to ruin either acting or dialogue (making it completely wrong, or either childish).
Those are what I can list on top of my head for now. If anime or Japanese/Asian style does not suit your tastes in general, then too bad.
- Shin Megami Tenshei (Persona) / Digital Devil Saga
- Ar Tonelico
- Tales of Series
- Final Fantasy Series
- .hack// Series
- Valkyrie Profile
- Arc the Lad
- Dark Cloud
- Fatal Frame
- Genso Suikoden
- Grandia
- Shadow Hearts
- Star Ocean
- Xenosaga
Those are what I can list on top of my head for now. If anime or Japanese/Asian style does not suit your tastes in general, then too bad.