Fun question, because the answer is that yes, Arthur is mute, however! It is always in a different way. For example, in SKIP he is silent because he is from a silent movie, in TPatJ he was a mute from birth, in Revamped (which I stg will happen one day) it was caused by an injury and so on and so forth. Mesi sounds slightly different each time, depending on where she is from/has been brought up, but in the original SKIP she hails from Johannesburg and so has a clipped, well-spoken South African accent (which was originally based off the voice of one of my pals from VFS, who I could never grow tired of listening to!).