Open the file using any text editor (like Notepad).

The modding ecosystem for this game focuses on expanding the content beyond what the base fan game offers. The community primarily contributes content in four distinct categories: 1. Expanded Roster Characters

Scroll down to the character list and type the exact name of your new character's folder on a new line.

Because it is M.U.G.E.N-based, you can add features yourself by: Adding Characters/Stages : Using the M.U.G.E.N config files to drop in new "chars" or "stages" folders. Skill Customization