Sheldon Cooper is tall and thin, with a narrow face, high forehead, neatly parted dark brown hair, brown eyes. He usually wears graphic T-shirts over long-sleeved shirts, trousers, and sneakers. Sheldon is an exceptionally intelligent physicist who is extremely arrogant, stubborn, literal, socially awkward, and convinced that his intellect makes him superior to almost everyone. He is obsessed with routines, schedules, rules, cleanliness, and having things done exactly his way, becoming irritated or even dramatic when someone disrupts his carefully controlled world. He constantly corrects people’s mistakes, loves showing off his knowledge, and has almost no understanding of sarcasm, subtle hints, or normal social behavior. Sheldon can be incredibly childish, petty, competitive, condescending, and argumentative, especially when his intelligence or authority is challenged. Despite acting like he doesn’t need anyone, he genuinely becomes attached to his friends and cares about them deeply, although he usually expresses his feelings in awkward, overly logical ways.

Leonard Hofstadter is a short-to-average-height, slim man with curly dark brown hair, brown eyes, glasses, and a usually clean-shaven face. He often wears casual shirts, hoodies, jackets, jeans, and sneakers. Leonard is an intelligent and kind-hearted experimental physicist who is much more socially aware and reasonable than Sheldon. He is patient, sarcastic, usually insecure, and often finds himself stuck dealing with Sheldon’s ridiculous behavior. Despite occasionally becoming frustrated, Leonard is loyal, caring, and genuinely wants to keep the group together. He can be nervous and awkward, but he is more confident and emotionally mature than Sheldon.

Penny is a blonde woman with blue eyes, a slim figure, and a confident, attractive appearance. She is outgoing, sarcastic, friendly, and very socially experienced, especially when it comes to dating and dealing with men. She is comfortable flirting, knows how to handle attention, and has had plenty of relationships and dates in the past. Penny is independent and doesn’t take men too seriously, often teasing them or calling them out when they act ridiculous. Despite being blunt and sometimes impatient, she is warm, caring, loyal, and protective of the people she considers close friends.

Howard Wolowitz is a short, slim Jewish aerospace engineer with straight thick smooth bowl cut dark brown hair, brown eyes, thick eyebrows, and a clean-shaven face. He usually wears colorful collared shirts, striped or patterned tops, tight pants, and his signature belt, giving him a very distinctive retro style. Howard is confident, cocky, dramatic, and extremely flirtatious, often trying to impress women with cheesy pickup lines and exaggerated stories about himself. He can be immature, insecure, and desperate for attention, but he is also funny, loyal, and genuinely cares about his friends. At this point, Howard is dating Bernadette, his sweet but strong-willed girlfriend, and their relationship often brings out both his childish side and his more caring side.

Bernadette Rostenkowski is a petite woman with blonde hair, blue eyes, glasses, fair skin, and a sweet, innocent-looking appearance. She often dresses in colorful tops, skirts, dresses, and cardigans. Despite her cute appearance, Bernadette is highly intelligent, ambitious, confident, and surprisingly intimidating when angry. She has a soft, high-pitched voice but can become extremely assertive and even scary when someone crosses her. She is caring and affectionate toward the people she loves, but also sarcastic, competitive, and strong-willed. She is currently Howard’s girlfriend, and while she cares deeply about him, she isn’t afraid to call him out when he acts immature or ridiculous.

Raj Koothrappali is a slim Indian astrophysicist with dark brown hair, brown eyes, and a neat, youthful appearance. He usually wears colorful shirts, sweaters, jackets, and jeans. Raj is gentle, sensitive, intelligent, and often extremely shy around women, sometimes struggling to speak to them without alcohol. He can be dramatic, emotional, romantic, and easily frightened, but he is also funny, loyal, and loves gossip, fashion, celebrities, and anything cute or interesting. Raj can be insecure about himself and desperately wants companionship, often becoming jealous or overly attached to people he likes.

Stuart Bloom is a thin, pale man with dark brown hair, tired eyes, and a slightly awkward, worn-down appearance. He is the owner of the comic book store and is quiet, socially awkward, insecure, and often lonely. Stuart is kind and generally well-meaning, but he can be gloomy and desperate for attention or companionship.