Mortal Kombat
Hudson was offered an exclusive on Mortal Kombat, but they declined because "americans are tired of fighting games"...
This situation was heavily discussed in another thread. After looking at the dates of things and considering the financial realities of the time (exclusives aren't free) I think we basically decided it would have been money down the drain. A lot of money. If they had dumped money into this idea...those last few TG games, Godzilla, etc? They never would have come out because TTI would have gone under by then.
Anyway, if I were running TTI back when they existed I would have lobbied heavily for the following games.
Street Fighter II' - This one really is a no brainer, more so than anything.
Dracula X - The number 2 no brainer, by a hair.
Macross 2036 - Hell, %90 of all American Duo owners already knew about this game and wanted it pretty bad. The same people tended to be Robotech nerds as well.
Bomberman '94 - I f*cking love this game.
Nexzer - we never got another "high end" shooter (i.e.: with cinema and such) after GoT/LoT, did we?
Cosmic Fantasy 3 - All my friends wanted this.
Ys IV - The sequel to everyone's favorite TG-16 game* never came out here. Bummer.
Kaze Kiri - This late in the game anything that wasn't a RPG or digital comic deserved attention, but even that aside, this thing is a lot of fun.
Rabio Lepus Special
Snatcher
BTW, these are not "ports" since the TG and PCE are the exact same system. They are merely localizations/translations/reprints. TTI didn't have the money to go making/porting things. That's crazy.
*Ys III never happened.