Largest character roster in a fighting game
Who
Tobal 2 (Dream Factory, 1997)
Where
When
The greatest number of playable characters in a fighting game is 200, featured in the Japan-only PlayStation game Tobal 2 (Dream Factory, 1997). Featured in Guinness World Records Gamers Edition 2011

The game was published by Square and featured appearances from several popular characters from the company including its iconic Chocobo mascot.