My guess next chapter either Asta and his crew show or maybe Gordon and Nero show. I would say Mimosa too but I would prefer her go back up Yuno and Langris for golden dawn pride. I can also see either Nozel or Dorothy come in to buy some time.
I'm betting on nero too! Lolopechka trained them (nero, mimosa, noelle) to beat megicula so I'm hoping to see them in real action here! tho I'm also expecting to see mimosa fight alongside yuno and langris for golden pride as you said. WHY IS IT SHORT (╯°Д °)╯╧╧
Gaja </3 (/TДT)/
Loro is gonna be a wreck if she makes it out alive ╥﹏╥