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The anime may not have shown this enough for you to pick up on, but the manga should have. There's a correlation between Eri's horn and her quirk. You see, her quirk may live in her blood, but it also builds up in that horn. When the horn is basically gone (which is the case following the events involving Overhaul), her quirk isn't strong enough to do much of anything. But when her horn is fully pronounced? That is when she is at her most powerful – and dangerous.

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Eri's quirk is called Rewind. That name should give you a great idea of what she can do, especially combined in what we've seen her do so far. She has the ability o rewind a person's body back to a certain state.

That means she can put a body back to before it was injured. Or, say, Rewind Mirio to a point before he lost his quirk. This hasn't happened yet – but it's something they've been building towards, so we feel confident that we'll be seeing Mirio with his powers once again.

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Poor little Eri has been so much in such a short life. We've no doubt that she'll face emotional scarring from that. But what about physical? That we're less certain of. It depends on how much Overhaul has used his quirk on her. We believe that she has been 'reset' several times with his quirk.
Since Eri was injured at the time of her rescue – based on the wrappings we see her wearing – we're not certain. It could be something that Recovery Girl can heal. Or it might not. Our bet is that she's going to bear some scars – at least until she learns how to rewind herself.

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Did you spot the potential connection to another anime? We already know that several elements from MHA are pulled from other series (many from comics). So it makes sense that other anime had an influence as well – intentionally or not.

In this case, we're referring to a similarity in the quirk itself. One could argue that the healing factor in Rewind is reminiscent of Soten Kisshun's healing ability (from Bleach). It's possible that this is just a coincidence, but we'd like to think it isn't.

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Did you happen to spot the physical similarities between Eri and Tomura Shigaraki? We doubt that there's actually a family connection here – but who knows? There's certainly some iconic matching going on.

Both Eri and Tomura have white/lightly colored hair (though sometimes it looks like Eri's leans more towards a blue). Both have red eyes. The similarities actually go further than that as well. With both of them having tragic backstories thanks to their quirks, which resulted in the death of a family member. More than that, both of their quirks are pretty uncommon and unique. Interesting, no?

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You may have noticed that there are two ways to activate Eri's quirk – one she hasn't yet learned how to control (as evidenced by the time she was helping Deku). And then there's the other. Where it can be bottled up and turned into a weapon. You see, Eri's quirk literally runs through her blood. It can be removed and altered to a certain state, especially given the technique that Overhaul has developed. It's clearly not an easy process, based on the level of failure we've seen. But that it is possible at all is mildly terrifying.

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Given everything that Eri has been put through, it would be completely understandable if she had shut down, emotionally. It'd be a reflexive way of protecting herself, after all. But that wasn't the case. Eri is actually an extremely caring and considerate individual.

We've already seen her put herself in danger several times for the sake of others. The first time we saw her, she ran back to Overhaul so that he wouldn't harm two boys she just met. Later, she chose to work with Deku because she realized that this cycle had to end, and her hiding away was just allowing it all to continue.

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At this point we've all got a pretty good understanding of Shie Hassaikai – and what Overhaul has turned it into. But did you know that Eri has a direct familial connection to Shie Hassaikai? That's how she ended up in Overhaul's 'care' in the first place.

She's the daughter of 'The Boss' – the leader of Shie Hassaikai. He left Overhaul responsible for her care – and no, he wasn't terribly thrilled with what was happening there. Though that had more to do with what Overhaul was trying to accomplish, than what was being done to Eri.

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You may or may not have picked up on this part (being that this was revealed during a very intense moment in the series) but Eri's mother isn't dead. It's easy to assume that she is, given who was left responsible for raising her.

After all, what kind of mother would leave her daughter at the hands of a person like Overhaul? No wonder so many fans assumed that he killed her. But no, Eri's mother willingly walked out of the girl's life. She did so after Eri accidentally used her Rewind quirk on her father – to disastrous effect.

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You might have picked up on this hint, unless you've been reading the manga, in which case the hint has really become clear as day: a trainer has already been established for Eri. By that we mean, a character has already stepped up to be in charge of her training. She needs to learn to control herself, after all.

The decision is very logical, and thus fairly obvious. Eraserhead is the only person who can shut down her quirk, and thus he's the safest person for her to be around. So he'll naturally end up being the person to teach her control.