WMG / Cursed Blood

Izuku will be the League's #1 priority during the School Trip Arc.

It is likely that once All For One has gathered enough data on the full scope of Izuku's Healing Factor, he will have the League target Izuku so that he can take his Quirk for himself. With the sheer number of applications Izuku's Quirk has in both its ability to heal fresh injuries as well as improving one's health, All For One will try to take Izuku's Quirk.

His fight with All Might years prior had rendered the otherwise unstoppable Big Bad into a Dark Lord on Life Support, relying on various Quirks to navigate without eyes and only being able to move on his own for a limited period of time, so he would have everything to gain from taking Izuku.

It is unlikely that that he will successfully take Izuku's Quirk (given that is the premise of the fic itself), so one of three things will happen:

1. One of the students in Class 1-A will get captured instead, Izuku plans the rescue mission and things play out like in-canon (All Might battles All For One, All Might wins, "One For All" leaves him for good and All For One is sent to Tartarus Prison).
2. In the camp's invasion, they obtain a sample of his blood thanks to Himiko Toga and that blood is used to heal All For One, restoring him to his original glory, his rematch with All Might never happening and All For One taking a more hands-on role in the League's activities.
3. In contrast to the above, Izuku's blood would put All For One under Izuku's control, and he will try to use this connection to order AFO from afar. Undoubtedly to capture the rest of the LOV and bring them in and make it easier to keep AOf locked up.
4. Alternatively, as the League doesn't know the specifics of how Cursed Blood works, they might attempt any of the above only for the plan to fail when Cursed Blood either dies out before they can use it or they attempt to use it but it tears whoever has it apart from the inside.

While AFO stealing the Quirk seems unlikely, as AFO, while watching the Sports Festival deduced Cursed Blood as being at least partially sentient, and mentally commented that while he could take the Quirk, and other sentient Quirks, any Quirk with sentience or semi- sentience usually ends up rebelling and make it a pain to try and control, and generally not worth stealing, he'd rather convert Izuku to his side using any means necessary. Still giving the League of Villains a reason to try and kidnap Izuku.

Izuku will heal All Might's debilitating injury after his fight with All For One.

Kota Izumi will develop a crush on Lily (or vice versa) during the School Trip Arc.

Because it would be adorable.

Eri will be the cure for zombification.

It is established that if Izuku uses his blood on a corpse or a dying person who reaches past a certain threshold, they do not return to full-health, but become a zombie under his thrall, requiring regular ingestion of his blood to remain functioning. This theory exposits that for as long as the zombies are acting, Eri's "Rewind" will return the zombies to complete functionality, restarting their various bodily systems, undoing whatever necrosis they would go under and declare them legally living human beings. The first time this happens it will be by complete accident and - much like with Le Million's quirk - they expect to revive Izuku's other zombies as soon as she learns how to control her powers.

The Quirkism the Author is writing in this story is a reference to Colourism in Latin America

The Author themselves is Mexican so such examples are drawns from their real life experiences.