The game is under constant development, and of the many possible characters, nine are already available, among them bronze saints such as Pegasus Seiya or Phoenix Ikki and gold saints such as Leo Aioria or Gemini Saga, as well as characters from the Asgard saga.
Every character has its own special attacks, and in many cases, they come with spectacular animations taken from the anime itself that vary depending on the players involved. In fact, depending on which characters are fighting, they will have different introductions and dialogues.
Besides your standard arcade mode, it's also possible to fight against another player, play in practice mode, or view AI-controlled fights. Without a doubt, Saint Seiya Ultimate Cosmo is one of the most promising fan games you can currently find. And despite the fact that it's not yet finished, it still has a set of fighters and overall quality that you'd expect of a finished game.