Some magic bad guys try to open a rift across dimensions, the jusrice league stop them but not before something comes out of it: an overpowered 6 year old shirou emiya with no memories
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Martian manhunter's telepathic scans only reveal a weird mindscape(unlimited blade works) but no glimpses at actual thoughts or memories
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Shirou gets sent to live on mount justice with the young justice team for survailance. On the first morning mc gets up early to prepare breakfast for everyone and the team caches him with a knife in hand, they panickedly ask him to let go of the knife, so shirou just dissipates it into motes of light(as the knife was just a projection), which shocks the team further
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When megan shows her bioship to the team, shirou tags along as it was not supposed to be any danger(yeah, this is the mister twister episode), and by the end of the day he ends up saving the team from mister twister using a(or maybe several) noble phantasm (s)
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Mc will be a mix of shirou emiyas, including kid shirou, counter guardian archer, etc. He will also have a reincarnator in the mix(my excuse if i want mc to behave un-shirou like). And of course, his memory will be shambles, he will not recognize dc universe or fate
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The primary idea of this fic was to have the justice league deal with an overpowered young child, someone who is both strong enought to best their heavy hitters like superman and is therefore a valuable asset against threats on the level of darkseid and trigon, but is still an inocent young child who needs mothering. The league will have to tread carefully between not suffocating the child with restrictions and letting inocents die when mc's powers could have helped tremendously, and not treating mc like an emotionless weapon/toll and exposing an inocent 6 year old civilian to danger. I once red a fic of mha where izuku opened an orphanage for overpowered children, the idea of this fic here was inspired by that fic