Regulus In Wonderland

Alice in Wonderland - Marauders story
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Regulus Black hears tales of a wonderful place with magic and beautiful creatures. His brother, Sirius, tells him of his travels between the realms before one day mysteriously disappearing and presumed dead.
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I know the original story implied that everything was inside Alice's head, but you can imagine if it's in Regulus's head or not. Animagi are a thing in this (not in the wizard way, in a shapeshifting way).

Mental illnesses (bipolar, hysteria, schizophrenia) are mentioned fairly often.

Close to every character is being portrayed as a character from Alice in Wonderland (ex. Regulus -> Alice) this doesn't always mean I think this character is similar to the one its portraying or its going to act similar, the MaraudersEra character will be used to fill the role of that character. It also most definitely doesn't mean I ship the Alice in Wonderland characters that the Marauders are portraying (ex. Jegulus -> Hatter×Alice)