I think that I discovered ( a lot of) potential evidence for Rouxls Kard to be Friend, but I didn't write the script and gonna add it some time later in here.
So I will just print out some obvious visual connections, for the thread to be not empty
Rouxls Kard is Rules card, like hand of a Ruler, and we know that Friend is the puppeteering hand.
ICE-E and Rouxls are Blue. Which connects to water, which connects to Friend and ICE-E being in-universe character based on Friend which is very likely.
Again, there are parallels between the Knight and Rouxls so it makes senses within the context of Friend Knight theory.
My presumption (and assumption) is that Rouxls is an idea of Friend being a ruler manifested into a darkner, while ICE-E is a character based on the prophecy, but like through a gartic phone of various sources based on the prophecy and on themselves, because Friend is mentioned in the prophecy (not the tail of hell, that's the Yaldabaoth, and I would assume that Friend is older than Susie so it would make sense in time periods)
This is all for the moment. Two more characters added for my "Friend = Mike = Eram = ICE-E = Rouxls Kard = Knight" Theory.