Dragon? Demon? or... What is he!

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This is a plot bunny that popped up in my head a few days ago, this as you can see has not been thought out as well as my other challenges, but it is still something i know someone would want to make.

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It never sat well with me how Natsu is portrayed in neither the manga nor the anime, by this i mean his history.

Now me explain myself, my problem comes in three very distinct questions.

1. Why is Natsu the "Younger" brother? He is simply referred to as Zeref's brother, no age distinction is ever given as far as i know, there is also the fact that he "Resurrected" Natsu into the form of the Etherius demon E.N.D., as such, should not Natsu be the older brother?

2. Why is E.N.D. portrayed as a mad and bloodlusting demon by most people? The only things we know about E.N.D. is that he liked fighting, but so does Natsu, he likes the challenges of strong opponents!

3. Why is Natsu mostly only shown using the Fire Dragon-Slayer arts? Given his pre-disposition for fire magic given both his fascination with it and his background as E.N.D., given that as an Etherius he Is a "Great Fire" demon! There is also the fact that Zeref's grandfather is Merlin, that would make him Natsu's as well right?

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There is also of course the problem with what happened to his memories of before becoming "Natsu", you can't just "Erase" memories that is That old, unless you destroy the part of the brain that holds those specific memories.

So could it not be possible that the "Sealed off" memories, given how fragmented they must be, have created dormant personalities or even that Natsu is one of said personalities and that the others, cause there is no way in hell there isn't at least two others, just don't want to wake up for some reason, unless something triggers them.

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So here is my story, what if when Acnologia attacked, Natsu got thrown off the island or alternatively he was not affected by the dragons breath cause of a reason, such as the fact Natsu consumed Etherion, it has been shown that Dragon-Slayers can gain the Element/Alignment of other Dragon-Slayers, what is to say that this doesn't work with magic consumed through other means or origins, there is also the reasoning that Natsu as E.N.D. could have just eaten Acnologia's breath in the past and gained an immunity or at least a resistance to pure Etherion type attacks, i know that Natsu was not a Dragon-Slayer back then, but it has been stated that Magic stays in the body for a long time and concider that Acnologia did attack Igneel when he was sealing E.N.D. or at least close after.

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Anyway, Natsu gets left behind on Tenroujima or in the water close by and since Mavis is awake the entire time she could help him recover whatever damage done to him from the attack or help him take shelter on a nearby isle, we do get told that there exists one close by, and as he is resting another personality wakes up instead of Natsu, this one is Etherius, one of three personalities created when Zeref lost his body in the war, given that we know he has no body, but his spirit is strong enough that he can choose if others can see him or not, as proven when during the Tartarus arc he appears infront of Natsu, but no one else can see him.

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Etherius then explaines to Mavis that he is one of three personalities and that Natsu is the youngest of the three and that the reason he had a child's form when Igneel was training him is because he is a specialist in fire Magic, specifically "Blaze Make" and as such his body is a bit more malleable so because Natsu was such a "Young" personality he ended up in the form of a child, but Etherius also explaines that he do know other Magics, he just chooses not to use them.

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He then explaines that each of the three personalities represent one of the core fundamentals of E.N.D., Natsu represent his Indominable spirit, Etherius represent his power and the last one Dragneel, represent his skills and that Dragneel will only wake up if forced or in the presence of E.N.D.'s "little" brother Zeref, though Etherius can suppress him from waking up to a point without needing to bring Natsu awake again and going to sleep himself.

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You can also alternatively make it so that Etherius being the "oldest" of the three personalities, has the ability to use the abilities of the other two, Natsu's particularly easily since he and Natsu is so alike in personality though it would probably be best if Natsu and Dragneel are not aware of him or each other.

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Etherius needs to be able to access all of their combined memories, but Natsu only the ones from his life and Dragneel only from the darkest parts of E.N.D.'s life.

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Etherius and Natsu should slowly become the same personality, Dragneel should only wake up once, when they are in the dragon graveyard, it should be a reaction to the memories of the creation of the "Dragon King's Festival".

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Etherius should ask Makarov to seal him away once the Fairy Sphere lowers, mostly cause he has had his "Fun" a.k.a fight/get laid/drink/explore etc, but he should awaken after the first fight with Sting in the streets of the capital, cause Makarov doesn't think that Holy Magic is common enough so he uses that as a way to wake him up if needed be, the fight in the hotel doesn't happen, still doesn't change the fact that Etherius, like Natsu would be and is in that situation, he just has better control over his anger, is pissed about the situation with Yukino Agria, do note that by this point Etherius is already fully awake and acting as Natsu, not particular hard since Natsu is just like a younger brasher Etherius, personlity-wise at least.

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Makarov will tell the rest of the guild of Natsu's other personality Etherius the night before the fight with Sting and Rogue, but he will not explain about E.N.D. and Dragneel or his family history, though since Etherius, playing the part of Natsu, and Gajeel is out drinking, Gajeel does not hear this and is not told until Etherius reveals it after the fight, when Gajeel got back to tell the others about the dragon graveyard, that should be used as a comical relief scene.

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Etherius will kick Sting's ass, cause he is pissed at Sabertooth in general for their attitude guild-wide, and he should also be able to use an ability that looks like Gōka Mekkyaku(Great Fire Annihilation) from the manga Naruto, it's name should be "Blaze Make:Brilliant Annihilating Blaze" it should be explained somewhere in the story that the spell is, in the hands of Etherius at full power, able to easily wipe the capital off the face of Earthland.

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There was also a plot bunny about Natsu going through the twilight gate and ending up in the past.

There was also a plot bunny about that book that Marde Geer always hold, doesn't hold E.N.D.'s soul, but his power and somehow it gets destroyed and Natsu gaines "back" his full power alternatively also his memories from before becoming Natsu.

There was also a plot bunny about Etherius being drinking buddie with several dragons.