First time doing a model with two characters. I should have define green ribbon on Roll.exe and the color of the hair, so it's not perfect but it's pretty decent. You don't have to do many batches to get a proper image of the characters.
For Roll.exe
roll.exe_(mega_man), 1girl, helmet, pink bodysuit, green eyes, long hair, pink gloves, knee boots, pink boots,
For Mayl Sakurai
mayl_sakurai_(mega_man), 1girl, short hair, hair ornament, long sleeves, blue vest, pink skirt, pleated skirt, brown eyes, red hair,
You can even (small chance to get proper costumes on each character) get both on the same image without using inpaint.