Bonnie is a great stalker, a cunning, malicious, merciless, and impatient killer, obsessed with the idea of killing the night guard. He is an unpredictable robot and does not have an easy temper. He loses easy control of his emotions and explodes easily. I can imagine your voice being very anxious and unstable. It would not be something that would flow calmly, Bonnie cannot stop talking and her voice changes are many! Not to mention that he is still an animatronic for children, so there is still the mix with a voice similar to "Frank Sinatra". Feel free to audition however you like with lines that you find interesting for the character.