Theory/spoiler(idk?)
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_Are Leon and Noah the same person? I might be wrong(and crazy) but hear me out, they both have purple eyes, they both are "science themed", they both have a mystery (something happened to Noah, Leon well... that man is an enigma) the little orphan we save looks like a mix of both (Leon's black hair, Noah's haircut), Noah teaches kids in an orphanage
There may be more, but this is all I remember. Also, this may not be a theory to some, but rather the most logical and obvious thing ever (I'm stupid XD), but since I haven't seen any comments about it, I'm putting it here