What is order? And what number should I put?
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order=x is simply when the character will spawn when playing arcade, normally you want to place the more powerful characters in the bigger numbers, for example, you can see Minato Tomoka in order=7, if you go to the end of the file you will find these lines:
arcade.maxmatches = 2,3,5,0,0,0,0,0,0,0
;arcade.maxmatches = 0,0,0,2,3,4,1,0,0,0
top line is for aggressors, from order=1 to order=3 / bottom line is for victims, from order=4 to order=7
those numbers indicate the amount of characters of that specific order that you will fight in arcade, the bottom line indicates that I will fight 2 characters from order=4, 3 from order=5, 4 from order=6 and 1 from order=7.
Since you want to play as the character not against it, just assign any order from 4 to 7, the line you want to keep an eye on would the top one, since you will be playing as a victim that line will determine what aggressors you will fight in arcade
As per what ""EMPTYSPACE" to use when adding the character, just put her somewhere close to the other victims so you don't get confused, just pay attention to the section that says ";----------------------------------------------------------------ROW X", which determines when a row of characters starts. That will give you more or less and idea of where the character will show up