Glamrock Bonnie (or at least we THINK his name is Glamrock Bonnie) was decommissioned after an accident had occurred. Even though we never do hear what Bonnie sounds like, let alone SEE what Bonnie looks like, voice actors have the freedom to create a voice for him! (I do imagine Bonnie having that rocker accent, so sort of Canadian or slight English, not exactly American).

I imagine Bonnie being a very sarcastic guy who likes to tell awful puns. I also like to imagine that he would pull many pranks on his friends. However, Bonnie is known to be aggressive, especially in the other games.