-Devil May Cry's Dante (as long as it's not DMC2 since that game sucked or the new reboot's Dante). I would buy Vergil too.
-FFVII's Cloud Strife, Sephiroth and Zack Fair (I've seen people claim HT has tried to get that already, but Square Enix never gives out their rights to other companies)
-Isaac Clark
-Samus from Metroid
-Link from Zelda (Ocarina of Time or Twilight Princess)
-Tekken's Jin Kazama, Kazuya Mishima and a couple others
-Arkham Batman
-Soul Calibur's Siegfried, Nightmare, Kilik and Ivy
-Mortal Kombat Scorpion, Sub-Zero and Mileena
-Ryu Hayabusa from Ninja Gaiden
-Nathan Drake
-Castlevania figs (preferably Alucard)
-American McGee's Alice
Leaving Street Fighte off the list since Pop Culture Shock will be making 1/6 figs...