Normally, the current character doesn't have a mouth. However, there were moments where the character did have a mouth.
- In her "MY TEACHER MURDERED SOMEONE" video when she detected a serial killer.
- In her "MY TEACHER MURDERED SOMEONE" video when Eric Paul Engel was roaring at a student.
- In her "MY TEACHER MURDERED SOMEONE" video when there were certain transitions to Rebecca's face.
- In her exaggerated comedic rant where a person was thinking Rebecca is a dunce.
- In the thumbnail of her "HOW TO CREEP OUT YOUR FAVORITE YOUTUBERS" video.
- In her Q&A video, when she said "Becca! Why don't just draw a mouth? It takes like 2 seconds".
- In her "The Girlfriend Fairy" video when the character had a style modification for a few seconds.
- In her 1 million subscriber extravaganza where she included her kissing.