We know witches and demons exist in the game, so like- and this is a really stupid post of a thought- but imagine. Okay. Because this is hilarious.
Before getting pulled into the demon realm by Diavolo and Lucifer, MC met a witch. Maybe it was a family member or themself who ticked off said witch. But like-
MC gets cursed to turn into a sheep at the most random of moments. They’re still sentient and can walk and talk, and if they have a pen or pencil in their mouth they can kinda write, but... it’s just SO inconvenient. It’s especially troublesome when they’re trying to survive in the demon realm. It becomes a huge reason to form the pacts.
Not only to free Belphagor, but for survival. Maybe even to break the sheep curse. Poor Mammon is burdened with carrying them around, and Sheep MC has to panic inform Beel NOT to eat them when he meets them as a sheep for the first time.
And they’re like- college student age and survives off coffee, so they’re just tired all the time and so done with everything. But they’re still kind and ends up caring a bit too much about the brothers, so when they turn sheep they just STOP caring about consequences and just goes off on a tangent/lecture and BOOM! Battle won.
Everyone is baffled. Lucifer is questioning why he just tried to kill a sheep and is being massively guilt tripped by this crying and tired cursed college student. Asmodeus is wondering when sheep became so attractive. Beel is just hungry. Mammon wants money. And the cursed sheep human just wants sleep so they nag Belphie to share his cow pillow because REASONS.
Beel: “So... why a sheep of all things?”
MC: “I dunno, man, I like my wool jackets. They’re fluffy and warm.”
Mammon: “...Huh. And you’re SURE I can’t sell them? Or shave off YOUR wool? Because I could fetch a really high price for that color of-“
MC, screeching like a pterodactyl, batting him upside the head with a pillow: “NO!”