Hm. I feel like there's an argument to be made that Eirika-route Lyon has a bigger/more genuine interest in promoting public good/order/harmony/whatever, rather than explicitly playing god, and something something the demon king corrupts his good intentions something, though I don't know the source material as well as you, and black seems like it could fit as well.

And yeah, green seems like an okay approximation for Pelleas—in general, green seems like a pretty okay "neutral" option for characters I'm unsure of :P

...I felt awkward when I was doing this because I realized I don't have a very clear mental model of Joshua, despite the fact that he's one of my favorites D: