1.Maria died 50 years ago(the reason I still support Taismo is cuz there is a chance she still might be alive, anyways, back to Shadria)
2. SHE'S A HUMAN. And I dont like the "Elise-effect"(wich is hedgehog+human)
3.Maria is not reincarnated. And if she was, SHE WOULDN'T BE REINCARNATED AS A HEDGEHOG!!!!!!!!!!!! (I'm so sick of people making Maria a hedgehog T_T)
4.Maria is Gerald's niece. Gerald created Shadow. That makes Shadow and Maria COUSINS!!!!!
5. If Maria did come back, that would technically "kill" the Shadow we all know and love! He wouldn't want revenge anymore, or be dark and mysterious like we're all used too.