But remember, the boss has to match to the theme of the level, I really like a lot of these, I really want whoever the boss is, I want them to ask to work together, and V1 punches their hand away, and then they get angry
Not enough people talk about "CAIN PRIME", I think he's truly the perfect fit for p-3. Cain was basically the first killer; he murdered his own brother in the garden of eden. You could also say that he's also the first person to commit betrayal, which would perfectly fit with the theme of treachery. In the game where you fight as an unstoppable bloodthirsty murder-bot, fighting THE GUY THAT LITERALLY INVENTED MURDER just seems like the perfect conclusion for the final prime soul. In fact, according to the story, Cain doesn't even feel regret after killing his own brother, he's actually more annoyed by the fact that God branded him for life. So he's definitely not lacking in willpower. I can see Cain Prime as someone who sees murder and bloodshed as an "art", to the point that I can see him even caring about his "style" just like the player does. His Sanctum would just be a funnel where enemies are constantly dropped down in his arena and murdered just to appease him, that being the only way to contain him. I can imagine his entrance being a sort of bait and switch; you enter the sanctum and you're met with the entirety of P-2 in one single room, and just as you prepare yourself for the fight of your life, Cain drops down from the ceiling and obliterates every single enemy instantly, showing his immense power in a badass way. Cain would be a perfect mirror to V1: he'd be as insane, unhinged, bloodthirsty, and determined as us. The last prime sanctum would basically be the player fighting itself, and I think that'd be poetic and cool as fuck.
I have a theory that can be totally wrong What if there's a fourth "P" that only allows to enter after P'ng the first 3 P's You know, like the four roman number doors
I still belive we will meet Lucifer in the game, even if we dont fight him. God said he banished an angel to hell for questioning why he created hell. Maybe he will asist us against Gabriel in the final fight, or not since in Dante's Inferno he was neck deep stuck in ice. Anyways, since last 2 prime souls were Greek kings with ties to the underworld (Minos by being a jugge of hell and Sisiphus by escaping underworld temporarily) so I would expect the last Prime soul to be the same. Soo, my guess is it will be Jason. He was a hero that retrived the golden fleese and he was very much threcharus to his wedding wows and wife, Medea. He even badmouthed her to gods and comonfolk after she got her revenge (by cursing and cremeting the woman Jason was going to marry for political power and her own children so Jason would have no heirs.)