Novelty Games

[Gaia]

The original Kingdom Hearts would be considered one as it was the first real major video game crossover in the US that wasn't a fighter (Super Robot Wars being a licensing HELL and many thought it was practically impossible to put the hedgehog and the plumber in the same game at the time), it was hyped as it had an enormous cast of characters from various movies and shorts from Disney's renaissance era and characters from the ever-popular Final Fantasy VII with a dash of other colorful characters from the franchise. The series is still going strong and it is currently up to Dream Drop Distance for the 3DS, which was released awhile back in the United States. It was featured in Disney's 365 segment on the disney channel to help further the hype. Dispite success, the game got gradually harder to find due to the stores not being able to keep up with demand, and was the PS2's early powerhouse games that you can only find on a Sony console at the time, the mammoth fanbase shortly followed.

And yes, I still own my copy, too.