My thoughts =
I have never heard of Eddie Redmayne, the actor.
Or "Newt Scaramander", the character.
(As it was spelled in before you edited your title.
)
"Newt Scaramander" looks to be an attempt to make a character's
name from amphibian words. Newt and salamander.
Then I thought of looking up "Newt Scamander", the correct spelling of the
character's name.
Newton Scamander
I have enjoyed some Harry Potter films and books.
Snape was my favorite among the teachers.
If the actor patterned his portrayal of the character Newt Scamander
in a way that he believes best shows asperger's traits as he understands them
to be, that's his prerogative. I hope he does a good, reasonable, modest job
of it. Not a lot of silly exaggeration.