Simon Helberg as Howard Wolowitz
As an aerospace engineer, Howard has a bit of a chip on his shoulder and is often overly confident in his abilities. He is also known for his unique personality and fashion sense. He is also pretty loud, loves colorful clothing, and wears a signature bowl-cut hairstyle. Despite his sometimes annoying and arrogant behavior, Howard is a loyal friend to the other members of the gang, particularly Raj Koothrappali. He is also fiercely devoted to his mother, who is often heard shouting at him from off-screen. Over the course of the series, Howard’s character undergoes significant growth and development, particularly after he meets Bernadette Rostenkowski and eventually marries her.