More Hidden Characters!

[D-Squall]

After I finished the game with certain conditions I made a hidden character appear, but I know that has 3 more, I need to do more conditions to gain new character or just play in other levels?

[Indinera]

Other modes most probably

[D-Squall]

Thanks for answering, I thought that I would have to finished the game in all modes with the same conditions I made to gain the character that I have now for finishing the game before with a condition.