Conversation so far:
What is a typical character for him?
Simon's characters are typically portrayed as "imperfect, unheroic figures who are at heart decent human beings".
Does he act as characters?
He reproduces speech so "adroitly" that his characters are usually plausible and easy for audiences to identify with and laugh at.
How does he come up with ideas for his characters?
Before writing, Simon tries to create an image of his characters.
What is a well known character?
Many of Simon's most memorable plays are built around two-character scenes, as in segments of California Suite and Plaza Suite.
What does the public think about his characters?
Simon's characters often amuse the audience with sparkling "zingers," believable due to Simon's skill with writing dialogue.
Are there any other qualities the audience enjoys?
His characters may also express "serious and continuing concerns of mankind ...
rather than purely topical material".
What does his characters look like ?
CANNOTANSWER.
What is an interesting fact regarding his characters?
Simon's characters will never be seen thumbing his or her nose at society..

Question: How did he learn to create characters?
Self-contained rewrite: How did Neil Simon learn to create characters?