How to set Arcade fight order
Assigning Character Order
In Mugen you can set the order that you fight your opponents in Arcade Mode in by editing the data/select.def file. First you can assign order numbers to each character by following these instructions How to add characters. These groups can be assigned between the integers 0 and 10. When a character's order is set to 0 it means that the character will not be selected as an opponent in arcade mode.
Setting the Fight Mix
After assigning an order to each character then you can scroll to the bottom of the select.def file. Here you set the maximum number of matches to fight before game ends in Arcade Mode. The first number is the number of matches against characters with order=1, followed by order=2 and order=3 respectively. For example, for 4,3,1 you will fight up to 4 randomly-picked characters who have order=1, followed by 3 with order=2 and 1 with order=3.
arcade.maxmatches = 4,3,1,0,0,0,0,0,0,0
Maximum number of matches to fight before game ends in Team Mode. Like arcade.maxmatches, but applies to Team Battle.
team.maxmatches = 4,3,1,0,0,0,0,0,0,0