I am not sure I understood completely what you want to tell me but remember that BERSERK is not finished yet.chugoku sensei said:Yes, but are you sure Muira was necessarily only working with a conceptual model in his work, that is, I think you are ignoring the "plot" of the comic. Whereas in terms of the fabula, Guts and Griffith are both just symbols of opposing concepts, within the syuzhet, "this comic has a cool plot," context, Griffith is the antagonist.
By the way I believe we are stretching this too far. I am saying that the agonist-antagonist is the serenity-hatred of Guts and you are saying that instead it Guts-Griffith. Hasn't Guts helped Griffith to be where he is now?
Hasn't Griffith spared Guts at the valley of swords and showed that was there for his personal interest of how he could feel and not for Guts himself? Then how could Griffith be the antagonist of Guts, if he is not so interested in him?
Maybe Guts is Griffith's antagonist but practically he has still helped him to be where he is now as said above, which means that neither this state is correct.
I still opt for the serenity-hatred as the best and most interesting agonist-antagonist concept in the plot. BERSERK hasn't finished yet, but I hope it gets the way I want to see it.