first... you get tha ending file (def, sff and mp3 or midi, etc)
now you open your charactr DEF, look for arcade
and write the name of the ending file for example....
introstoryboard...
ok i figure out how to add a chars in mugen
1. download a chars you cant download one in:http://www.infinitymugenteam.com/
2. open your eve mugen
3.go to chars
4. put the folder in chars
5....
when you unzip the character put it or unzip it to the "chars" folder.Then copy the name of its folder. Now go to the "data" folder and open the select.def file with notepad or wordpad. scroll down...