Normally, the current character doesn't have a mouth. However, there were moments where the character did have a mouth. Inclusion of mouths from YouTube animators do not count in this list. She used a mouth in...
- My Teacher Murdered Someone when she detected a serial killer.
- My Teacher Murdered Someone when Eric Paul Engel was roaring at a student.
- My Teacher Murdered Someone when there were certain transitions to Rebecca's face.
- her exaggerated comedic rant where a person was thinking Rebecca is a dunce.
- the thumbnail of How to Creep Out Your Favorite YouTubers at Conventions.
- her Q&A video, when she quoted the commonly asked question: "Becca! Why don't just draw a mouth? It takes like 2 seconds".
- The Girlfriend Fairy when the character had a style modification for a few seconds.
- her 1000000 Subscriber Extravaganza where she included her kissing.