Alright. Let's go. We all know Berkard fucks, but what about romantic feelings? Is that something he is capable of, or is it similar to Thial'thu where he may experience some form of attachment but it may not necessarily be love.
I think Berkard wants to feel love and if there’s anyone of the three demons most capable of feeling it, it’s definitely him.
Let's say MC is so deep down the rabbit hole of depression, anxiety and self-loathing that they don't value themselves or have much reason to live. Thus upon getting a bit used to Berk they just go "well I'm useless so let's just try to reach your goals instead; at least someone would be happy that way" and are basically fine with Berk taking over their life and creating as much chaos as the demon wants. What would Berkard think of the situation? (Unless is spoilers, then sorry and skip it)
I’ll say it’s not too spoilery, because I don’t think you can get this dark in-game. I’m trying to make this game just a bit lighter in tone than my other one with talks of trauma (some characters have trauma, but the central theme is not trauma, and thus not lots of dark trauma like sexual trauma, like in HoF), but canonically, MC has issues. This answer will touch on them and their relationship with Berkard. Again, not too spoilery but I’m putting it under a cut because it might be spoilers enough for people who don’t want their opinions of the demons colored by these ventures into their inner thoughts.
As said, MC canonically has issues and this is what makes them mesh so well with the demons, what enables the demons to get so deep into their head.
Berkard is cold, he’s using the MC’s issues to use them. He thinks the issues are great because it makes things easier for him (and he has issues, he has lots of issues, so what does he care) But in his own misguided way, he’s also on their side. MCs with no will to live, he thinks he can breathe life into them. They’re going to be sticking around for a while, so might as well find a way to enjoy it. Besides… you’re falling into the corruption of hell, you’ve no clue how those depressed thoughts are going to hold up the deeper you go. He can make you useful, he can make you realize your value, he can make you find your own happiness in the destruction the way that he has.
You’re more similar than you think, and he’s teaming up with you; not making you into a puppet. So don’t go limp. Raise your hand to the world that’s wronged you. Let him help you. He. Will. Destroy for you.
Many eyes narrow, the dual-baritones of Thial’thu’s voices beginning to converge into one rumble as he answers slowly, carefully, “I don’t want to… And I won’t, little insect.”
Agitha laughs lightly, the haunting croaks of her birds trying to join in the sound of mirth. “How incredibly delusional of you to think I’d have any desire for death. If I were to die, which I won’t, I would certainly be bringing someone down with me.”
“To be fair, I didn’t know I’d last this long.” Berkard scratches lightly at the steel around his throat. Extra hands feel up his collarbone, attempting to form the impression of strangulation on his person. “I wouldn’t know, but I hope it’ll certainly be memorable.”
MC is dreaming of their childhood and how it was terrible, MC looks at their child-like self crying in the corner. They feel a familiar presence in their dream. MC: "Come to berate me about how fragile I am to you? Is that why your here?"
Thial’thu: A slow wave of a clawed hand and the scene before you vanishes like a smoke blown away. The shadow threatens to swallow you, the commanding presence seemingly always towering over you. The croak of that strange dual-voice feels more like a hug than it should. “I’ve always been here to build you stronger. History shan’t obscure goals.”
Agitha: Black feathers brush your skin before thin arms do, embracing you from behind. Sharply smiling lips threaten to leave their lipstick print on the shell of your ear. “Yes, you are quite fragile, little one. But that’s why you need me, isn’t it? Though you know that not. Yet.”
Berkard: The jingle of a shift is drowned by a dark chuckle. “These shackles should be yours instead, darling.” A pair of hands lead to a warm—too warm—body pressing so close to your back. Honey voice caresses you with a history of manufactured lust. “But that’s what we’re doing here, you know? Freeing us both.”
Oooo. Potentially humorous ask: Berkard or Thial'thu are doing their Thing, ranting or making the MC's life difficult. Reactions to the MC saying, "Shut up, Bottom"?
Berkard:
“Excuse me…?” (Does, in fact, shut up out of sheer shock and offense)
Thial’thu:
I could not find a gif or image that properly encompassed the series of emotions Thial’thu would go through. There are No Words. MC found unconscious on the side of the road.