Fic idea: Attack on Titan/My Hero Academia crossover

I'm likely never gonna write this, but it's just in my head, and I need to write this down before I forget about it, and I hope you can enjoy it too. I won't have room to ever write it, but this should be good enough.

Synopsis: Five years ago, two devastating villains appeared out of nowhere in the middle of one of Japan's biggest cities: the Colossal and Armored Titans. In the destruction that follows, it results in the death of the father of Izuku Midoriya, which Izuku saw with his own eyes at the age of nine. Just as sudden as they appear, they vanish without a trace.

Fast forward to five years later. Izuku, now in the prestigious UA academy with the power of One For All and motivated to avenge his father's death while also becoming a symbol of inspiration like All Might, receives two new additions to his class: two bright foreign exchange students from America. They reveal themselves to be Quirkless brothers, which shocks the entire class, particularly Izuku, who can easily relate, and marvels at how skilled they must be to enter the hero course without even having powers. The new students get along well with everyone: One of them is a bright, cheerful, optimistic, funny, and spontaneous boy who has a trail of laughter following him everywhere he goes, while the other is a calm, uplifting, inspiring role model who helps out the class and never has a bad word for anyone. I haven't decided on a name yet, but this is just a concept, after all. Call the funny one Student A and the role model Student B. I think of them like alternate versions of Firestorm and Noble Blade, respectively.

Both students become close friends with Midoriya in particular, who uses their inspiration to conquer his opponents and progress further in his training quicker than in the anime. Because they're Quirkless, both students skillfully utilize bladed boots and ODM gear with both gun barrels (firing rubber bullets) and sword blades in combat. At one point Student B tells him that he's a great kid, and that the Armored and Colossal Titans would pay for the tragedy five years ago, which cements their closeness. Student A, in the middle of his outgoingness, quickly becomes romantically attracted to Mina Ashido (the pink girl, you know?) because of their extrovert and smiley personalities. This, of course, provides plenty of teasing opportunities by the rest of the class. Other shippings would be TodorokixMomo, and the vanilla UrarakaxIzuku.

They follow the course of the story pretty closely with the student's participation: USJ, the Sports Competition, Stain the Hero Killer, the kidnapping at the camp, and the Kamino incident. Following the Kamino incident, where Student B was a part of the rescue team and is injured, he becomes nervous and fidgety, which the students notice. As they're moving into the dorms, they get to checking out the brother's rooms, eager to see what an American's room would look like. Rather than being overly decked out, they discover that Student A's wall is covered with sticky notes of the cheerful things others have said to him over the years to inspire him when he's depressed, which opens a whole new layer of Student A's personality to all of them. Mina Ashido proclaims that nothing he could ever think about himself would diminish her love for him. Student B's dorm room is painted an uneasy dark red, but otherwise is relatively normal.

As they reach the ground floor and hang out together, Student B pulls Izuku aside and finally tells him the truth: that he is the Armored Titan and that Student A is the Colossal, the attack five years ago was to try and draw out All Might's presence, and they entered UA as spies under the orders of All For One to find the next successor of One For All. At first Izuku thinks it's just a bad joke, but Student B finally snaps and reveals his quirk of regeneration, healing his injury, while declaring that the only option now was to accept himself and complete his mission. At this point, because the entire shocked class is listening by now, Todoroki, Momo, and Bakugo land mortal injuries on them. As they're bleeding out, in a flash of yellow lightning both students transform in front of the stunned and heartbroken class, with resolution on Student B's face and fear on Student A's right before the Colossal and Armored Titans emerge.

From there, the outline would deteriorate; they would capture Midoriya and go on the run from the pro heroes, still exhausted from Kamino. Izuku would understand that they were simply slaves acting under orders of All For One, and if they failed or if AFO was captured, he would kill them. Both students are torn between their duty to All For One and their duty to their friends, and in a bit of tragedy, both would choose to abandon their friends in order to complete their mission and finally be free.

That's just the gist of it. I'm also imagining plenty of humor, and romantic fluff, and drama in the beginning. Towards the end, there'd be a brawl between the Armored Titan and Mt. Lady that ends with her death, a reconciliation and bitter rejection of Mina Ashido, an all-out battle between Izuku and the Armored Titan, and the combination of the entire student class against the two that ends in their deaths.

So! Any thoughts?