The original Guilty Gear has a small but satisfying roster, with unseen before mechanics and matchups! The game released directly on PS1, without ever seeing an Arcade version. There is no story content available, but it still serves as an important intro to the Guilty Gear franchise.
The base roster features 10 characters, and you can also unlock Baiken (by completing Normal Mode with Sol or Ky and no continues), and the boss characters Testament & Justice (by beating the Normal Mode with any character).