If you put only 'StriderHien', Mugen automaticly searches for 'StriderHien/striderhien.def'... So, what could be the problem, is that Strider's.DEF file has a different name than Strider's directory. For example, Strider could have a.DEF file called 'Strider.def', but a directory called 'StriderHien'. In that case, Adding 'StriderHien' to you select.def would cause Mugen to find no.DEF file, and show no character box in your game. The solution: - Make sure Strider's.DEF file is named 'StriderHien.def' as well, and not 'Strider.def', etc. or - In your select.def, change 'StriderHien' to 'StriderHien/Strider.def I hope that was clear enough