ok, let's see (this will probably have inconsistencies, if so, sorry)

Dark blue Moon: considering that he might stay in the water more and only come out to attack, perhaps Hierophant Green or Iron Maiden might be able to defeat him first. (Iron Maiden maybe making spikes when he enters the ship and the Hierophant attacking him in the water).

Spice Girl: I imagine she can be defeated by Iron Maiden, it will probably be difficult for Iron Maiden because of the softening and maybe softening the thorns but I think Iron Maiden will win with difficulty. Hierophant, perhaps just fighting from afar is easier for him so he wins too.

Iron Maiden and Hierophant Green: Hierophant Green will probably win, considering he will probably fight from afar.

Fair argument i like it.