When it comes to common fears for humans, public speaking consistently tops the list, stemming very often from a fear of judgment, negative appraisal by others, or simply embarrassing oneself. While people experience this fear to varying degrees, it can become limiting when it impacts the character's decision making, resulting in them missing out on professional opportunities, giving up on a dream or passion, and ultimately living a life that is less than what it could be.

Avoiding opportunities or events where the character would have to speak to a group
Experiencing anxiety when speaking at a meeting or presenting a report to a client
Choosing a career with no public speaking requirements
Showing signs of anxiety when the character has to speak to a group (trembling extremities, dry mouth, a shaking voice, profuse perspiration, etc.)
Sitting in the back in venues where the character could be pulled up on stage—at a comedy club, for instance
Refusing to participate in school assignments that require public speaking (presentations, speeches, etc.)
Being able to perform in other ways for a crowd (dancing, singing, etc.), but experiencing anxiety at having to speak
Holding back information rather than sharing it in a group setting
Having a panic attack prior to a speaking engagement
Freezing up when asked a question in front of others
Showing up late to classes or meetings so the character can avoid the get-to-know-you questions at the beginning
Letting others take the lead in group projects and presentations
Frequently having stomach aches, headaches, and other physical prior to a speaking event
Masking the fear by making excuses for not speaking (it's a stupid assignment, someone else can present the material better, etc.)