Mc will call berserker heracles "oni-chan"(big brother)
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Mc will apear in a random spot in kuoh with no background, so they will go with the "i forgot my memories" excuse and say they only remember a few things, such things include beeing homeless and having met berserker when he saved her from beeing mauled to death by stray dogs and him treating her wounds, noticing berserker never speaks, noticing berserker was also homeless and the 2 deciding to stick together, and finaly, when trying to decide on a name to call him by, mc noticed he seemed to like the option "berserker", so that is why she calls him by that name, even if she still uses "oni-chan" most of the time(all cover stories)
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Also mc will be enrolled in kuoh but not berserker, reason beeing that illya got good marks on a test for schollarship and got to go study there 100 percent free of charge, while berserker bombed and got no scolarship (all rob's doing. In truth, mc just found a letter writen by rob stashed in her pocket explaining all that)
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The devils and other supernaturals will very much disbelieve the story of berserker beeing human, and will deduce him to be some kind of independent avatar sacred gear. Mc won't confirm or deny any of the supernaturals' suspicions on berserker's true nature
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The nemeam lion will recognize berserker as heracles when he first meets him(as heracles is the guy who killed him before it got stuffed into a sacred gear)
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Mc will know fate-verse, but i am not sure if she will know of dxd or not, i also don't know what to do with issei in this story but i will likely make him never be born
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Mc's personality will very much be that of an energetic kid
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I have a scene planed i just can't wait to see: the first school day ends and before mc leaves through the school gate to go home, she is stopped by issei and his friends. Unconfortable with the human trash in front of her, she have berserker materialise just behind the trio when no one is looking, making it look like "oni-chan" came to pick up his little sis at school and snuck up to the human trash to intimidate them into staying away from illya🤣🤣🤣🤣🤣. Can you imagine the trio's faces? The girl suddenly looks behind them and greets someone with a cutesy "oni-chan", and when they turn to see whi the girl's big brother is, they come face to face (or more like face to KNEE🤣🤣🤣🤣🤣) with that mountain of muscles in vague human shape🤣🤣🤣🤣🤣 (by the way, the excuse they will use for berserker's weird atire will be that mc and him are too poor(again, they say they lived on the streets) to buy clothes on berserker's size, as they need to be custom made since even the largest number most stores offer is too small for him, and the sole ready made thing they ever found in berserker's size was a greek soldier Halloween costume, and even then the top half of the costume (shirt and armor) was still to small to fit. Mc will also coment that before getting berserker that atire, he had to stich 2 doublebed blankets together and wear it tied like a bath towel arround his waist(yes, even just 1 doublebed blanket was still 2 small(yes, i made berserker even TALLER then canon🤣🤣🤣🤣🤣)))! I also want this scene to be the introduction of mc's oni-chan to the school(scene will also be from sona's pov, who wanted to aproach mc to discuss her status as a homeless pearson, but the trio got to her first and berserker showed up before she could reprimend them for bothering the new girl(after the drama, sona will talk to mc as planned and give her a house to live in with her big brother(a house she will build in a hurry to be big enought for berserker to be in. Sona will go through all that trouble because after seeing berserker she will think him to be illya's sacred gear and want to butter her up and eventualy get illya in her peerage)))
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One of the ideas i had was for mc to abuse heracles' imortality to "mahoraga up" his a*s🤣🤣🤣🤣🤣. For those who don't know, one of the versions of heracles' immortality also makes him immune to what killed him in the first place a là doomsday from dc. so after making sure heracles' life tank is full (12 lives max), mc will have him killed ONCE just so he can adapt to that, as heracles regenerates 1 life per day, mc will have more trouble finding new s*it to kill berserker with then waiting him to be at the 12 lives mark🤣🤣🤣🤣🤣
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Now, of course mc won't be cruel to her beloved "oni-chan", she will make sure heracles is on board with any of her ideas to murder him before doing so(*roll eyes* as if heracles will pass on the chance to get stronger and become better equiped to protect his beloved master, lol) and she will also use comand seals so he feels no pain during the "endurance training"(fgo rules on comand seal regen). Wording for the comand seal: "by order of comand seal, i hereby order your phisical body to feel no suffering during this next training session!"