If you need to seperate them you need to put names in the right places. Looking at it, it should be set up as 5 names, a bunch of blanks, followed by 5 names, then no blanks and 5 names. So to order it properly you would have
5xDC, blank, blank, blank etc, 5x marvel, 5xDC, blank blank blank etc and repeat. Mugen will always list horizontally until the end of the line, then go to the next row when it runs out of columns. Adding a character in that doesn't exist, like say, BLANK, will leave an empty box.