I still can't believe that Mohg was originally designed to be a generic boss that we would encounter in various places, I must thank Youtuber Zullie the Witch for discovering all this. His model name in the source code is 'GreaterDemon,' and he has a loadlist for places like Murkwater Catacombs, Raya Lucaria Academy, Gelmir and Auriza Hero's Grave. I imagine the developers looking at the ''Greater Demon'' and saying ''Damn, the final design of this Boss is too good to be a regular enemy, we should give him a story and a deeper context.'' It's like when you create something for a purpose but you end up liking the design so much that if or if you should put it in a more relevant place, the source code reveals that in the fight with Malenia, Miquella originally had dialogues during her sister's phase change – "My dear twin, accept this gift "A gift of abundance, my last drop of dew. Let all things flourish, whether graceful, or malignant." So Mogh and his entire story and context were added very late in the development of the game to the point that just to add Mohg and his story they had to throw out a lot of things that were already programmed and ready. I have no doubt that the developers at some point looked at the Greater Demon model and thought it was so good that they ended up turning it into the Mohg that we all know.
What a magnificent boss. Just outright a Villain, not a Hero that fell from Grace, nor a righteous guy on his own Quest, but a Villain through and through. Rare Occasion in Souls Games.
Edit: Dear Mogh, I would like to apologize from the very bottom of my heart. I wronged you severely by calling you a villain when you were, in fact, not a villain and merely controlled by Miquella. You were not a Villain, just another unfortunate Victim.
The all-knowing approves There's unused voicelines of mohg counting down from six in Latin (sex, quinque, quattor, tres, duo, unus) and just imagines full healthbar phase 1 and 2