Please don't flame me as this has been an idea that's been ini my head for months and i wanted to give it a go and .Remember that magic DOESN'T follow the laws of reality or pshyics or else animagi,transfiguration and all that stuff wouldn't work and I do not like people stating you can't do this or that cause he/she doesn't know how it works and i'll point out in the HP universe the inanimate to animate {Non-living to living} transfiguration and conguration spellsas i'm pretty damn darn sure that wizards and witchs don't know how the animals bodies actually work so who's to say acidental magic that is powered by feelings can't make something permenant via transfiuration or conjuration or change to suit it's weilders needs.
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8 year old Selene Lily Potter stared at the ocean from the little cave in an isolated cove she had taken shelter in from the wind and heavy rain caused by the storm she didn't know where her aunt uncle or cousin was as they had abandoned her after taking her to one of the out of the way and isolated islands and left her.

Selene sniffed she was alittle happy that she had taken the survival and first aid kits from the boat her uncle had rented it had actually been by her aunts orders she had mostly because her fat mini-whale of a cousin grew sideways and so was not in the best of shape for long walks and it had actually been 15 minutes into the walk that her uncle had made his move and hit her over the head with something and knocking her out, When she had come to it was nearing sunset and when she spoted the kits still with her but opened she found that the flares and emergancy becons missing but at least she had everything else including the worn and 4 slightly torn comics that she had learned was japanese manga from an only student who had seen her reading the 1st one she had fished out of a trash bin after it had been thrown away by another student so she was happy if alittle cold due to having had to hang what little clothes she had to dry near the fire she had managed to make from drift wood she had found near the cave entrance that was still mostly dry.

"Stupid durleys I hope the storm gets them" Selene says yawning as she puts on her still slitly damp clothes and then drags some of the larger drift wood logs onto the fire with some smaller ones to make sure it doesn't go out before laying down on the blanket from the first aid kit ment for someone who had fallen over board and a odd silver tin foil like blanket at least she thought it was that was from the survival kit, "I wish my gundam manga was real that this was a hidden OZ base" Selene sniffs and wraps the tin foil like blanket around her tighter and lets sleep claim her not knowing that her magic that had untill now been only able to heal her as she had not needed it for anything else other then minor bouts of fear or anger induse accidental magic but now it had something to focus on as it spread troughout the cave and the cove warping the very fabric of reality as it worked to make Selene's wish real going so far as to draw in ambiant magic but in doing so put Selene into a coma but magically suspended to stop her aging.

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July,31,1999 what should have been Selene's 9th birthday was when Selene woke up from her Coma still 8 years old not having aged a day and ironiclyit had been her 8th birthday that she had been abanded and tho her body didn't age the same couldn't be said about her clothes sadly and so she only had rags that she had to hold onto just to keep from being without clothes so it was somewhat supprising when she finally focused that she noted that the cave she had found had changed and looked more like a base with a dock and what looked like hangers but both the dock and hangers was empty she blinked and started to look around mostly due to needing clothes that she didn't need to hold onto all the while not knowing that she had screwed up the plans of a old meddler that thought himself the next coming of merlin as her name changed from being on the list of hogwarts 2001 students to the hogarts 2002 students list or that due to her wish her magic had also changed in a way that it worked with mudane Technology making her the 1st technomancer of her world.

{Time Skip 2 and a half years}

January 31st 2001 what would've been her 1st year of hogwarts saw 10 and a half year old Selene working on the final touches of of what she was working on as her magic during the year she was in her ageless coma had not only made her a hidden OZ base with all the tech it also had everything needed to build both ships and subs along with modle suits and 1 gundam she still didn't know about magic only that she can make the computers and machines of the base do what she wanted and so at the dock was a nearly completed carrier sub and a trio of moble suits ment for underwater use and a half completed gundam ment to be a mix of the wing and death scythe gundams all the while ignorant that her not appearing for the 2001 class of hogwarts had caused a massive search by wiarding britain.

{Time skip 5 and a half months}

July 15th Selene was happy as she wore a pute white female version of Zechs Marquise OZ uniform minus the masked helmet was looking over the completed carrier sub and mostly completed gundam with the 1st Leo based mobile suit having just finished the day before and so it was a supprised to ehr when she herd a crack like a gundshot that she had jumped slightly and ducked behind a crate while she used her power over machine to activate the Leo to make sure she wouldn't be defenceless.

"Are you sure she's here Albus?" a female voice that must have been around her late 50's to early 60's asks while an male voice older then the females resplies "My dear minerva young Selene's Hogarts letter is adressed to here as it reads 'Main dock,OZ main base, OZ island and seeing as this island wasn't named yet all my tracking spells points to her i'm guessing young named this island herself but i've never seen or herd of OZ before nor why a base would be out here just 2 miles from the wards of Azkaban" ah so the older male was this albus person and the female was called Minerva.

Standing up and coming out from behind the crate she used as cover Selene looks at the pair and had to do a double take at the pair as they both looked like they had ether just steped out of the middle ages or just came from a costume party "Okay who the heck are you and how did you get here? as i'm darn sure you didn't come by boat or air as the bases security didn't detect you coming here and speak truehfully or else the Leo behind you with open fire" as she points to the mobile suit that was now aiming it's weapon at them.