Responses

I think its a child in a very 'most primal/least civilized' sort of way, but they call it a child because its the least wmotionally mature. At least u hope that's what it is.
Sir Mugo is the most mature/most civilized/least primal, and then the last personality is in between Lil Monster and Sir Mugo in maturity and civilized manners.
So maturity wise:
Lil monster = youngest, like a child, difficulty controlling emotions and hunger
Second personality = teenager, semi able to control emotions and hunger
Sir Mugo = mature adult, fully able to control his emotions and hunger
Please say that the childish mugo Isn't really a child... I'm not gonna drop the book yet but if anything points to him being a child in an adult body I am leaving-