if there was ever a tv adaptation of the magnus archives i think sasha should be played by the same person as notsasha the whole time.
there are perhaps a few polaroids shown briefly in the background with someone you don’t recognize during s1, but they disappear in s2.
in the end, the viewer doesn’t remember the ‘real’ sasha either, because she was never acting in the show. all you have is memories of notsasha.
the first time we actually see the actor in the pictures from s1 is in the flashbacks at the beginning of s5; sasha and tim talking, jon’s birthday, sweet memories that just- don’t seem quite right, even though you know this is the true version.