While my feelings on Phantasy Star Universe are… complicated, I absolutely adore the portable spinoffs, Phantasy Star Portable 1&2 on the PSP. I especially fell in love with the second game, and to this day is remains my most-played PSP game.
A sequel/expansion to Phantasy Star Portable 2 was released, but stayed, in Japan. I bought a cheap used copy a few years ago, but to this day, I still haven’t played it. At least the packaging is cool.