Gravity Rush remastered US physical
.hack Volume 4 Quarantine
.hack//GU volume 1 special edition
Persona 3 Portable, Persona 2 LE, and Persona LE on PSP, plus Japan import of Persona 2 Eternal Punishment on PSP.
Shadow Hearts 1-3
Xenosaga 1-3
Lunar 1 and 2 on PS1, complete.
Legend of Mana
Darkstalkers long box
Are Xenogears and Dragon Warrior VII rare?
Giana Sisters DS
Short Peace, UK import.
Dead or Alive Xtreme 3 Hong Kong import.
Darkstalkers Resurrection, Japan physical import.
Queen's Gate Spiral Chaos, Japan import.
Metroid Prime Trilogy
Devil's Third
Shantae and the Pirate's Curse 3DS physical
Dragon Quest VI DS
A complete version of Metal Slug 7 seems rare, which I have.
Xenoblade Chronicles both Wii and New 3DS
Marvel vs. Capcom PS1
Marvel vs. Capcom 2 PS2
Ultimate Marvel vs. Capcom 3 PS4 physical
Capcom vs. SNK Pro PS1 I think
King of Fighters 98 Ultimate Match PS2 I think
Skies of Arcadia Legends
Metal Gear Solid The Twin Snakes
Resident Evil 2 and Code Veronica gamecube
Not sure how rare they are, but got Zelda OoT, Twilight Princess, and Wind Waker on gamecube.
Dragon Warrior III GB
Dragon Warrior 1+2 GB
Final Fantasy V and VI GBA (they seem pretty rare anyway)
King of Fighters EX2
Metal Slug Advance
Not sure if these 3 GBA games are rare.
Contra Advance, Spyro The Eternal Night, and Super Gunstar Heroes.
Not rare itself, but I do have a copy of BlazBlue CT Limited Edition signed by Noel's voice actress Cristina Vee.
Probably have some more pretty rare stuff, but that's all I can think of off the top of my head without doing research.