I think since Lord Mugo is the "godly mugo" he must be more in touch with the whole, the other are byproduct of trauma, he is the result. My boy has VIP clearence. But thats just a theory, a gay theory
I always feel like they're the id (monster bb), ego (jerk mugo), and super ego (sir mugo)
I had that same theory too
OMG the fact that you're using Freud's theory for a smuty yaoi is a first for me and I find it hilarious, but also I didn't though of it that way and now I'm intrigued!
Something that I've noticed from the start is that for some reason out of the 3 personalities, Sir Mugo is the most susceptible to the 4ths or "the original" one. Obviously all the personalities stem out of different traumas of the one that was the original human, so I wonder why specifically him...