Deeper Story Line: Xenogears.
Deeper Character Development: Planescape: Torment
Interesting Characters: Planescape: Torment (A Succubus that is chaste, a Mage who lite himself on fire for all eternity, Floating Armor, a Skull with Dentures! + Many More) And Q does voice work in it, enough said!
Enjoyed both of them tremendously, however Planescape: Torment remains to this day one of my favorite games EVER on the PC (Just below All things Homeworld)