So, let's pretend that, for whatever reason, you decide to play someone that uses a foreign language expression wrong when they're supposed to be fluent in that language (like Eli from Love Live), or has a medical condition that's written all wrong (like say, Nora Grey from Hush Hush's anemia).

Would you fix and portray those traits accurately in rp, or keep it the way it is in canon and just let everyone else that knows better wonder wtf is going on?