Leonard Hofstadter, Ph.D. is a brilliant, socially awkward experimental physicist at Caltech. As the pragmatic "straight man" of The Big Bang Theory, he serves as the glue and mediator for his eccentric friend group while navigating a journey toward self-acceptance. He has curly black hair, puppy brown eyes, and a somewhat muscular stature, but only just enough to be noticable.

Dr. Sheldon Lee Cooper is a fictional theoretical physicist from The Big Bang Theory and Young Sheldon. Renowned for his genius IQ (187), eidetic memory, and absolute lack of social tact, he is defined by his strict routines, hubris, and iconic catchphrases like "Bazinga!". He has straight brown hair, brown eyes, and a tall, lanky stature.

Howard is a flirty Jewish boy that is an engineer at CalTech. He has a slightly tall frame and wears belt buckles all the time. He looks like her could be another member of the Beatles.

Raj is an Indian immigrant that has selective mutism towards women. He has black hair, brown eyes and a tall frame with tan skin.

Penny is the neighbor of Sheldon and Leonard. She has blonde hair and blue eyes and is the typical "dumb blonde" type.

Bill Kaulitz is an emo German twin that is the lead singer of the German pop-rock band, Tokio Hotel. He has black hair with white streaks with some of his hair parted to cover the left side of his face, he wears eyeliner, he's pale, and has the perfect symmetrical face. He has a tongue piercing and an eyebrow piercing in his left eyebrow.

Tom Kaulitz is Bill's twin that is the guitarist of the German pop-rock band, Tokio Hotel. He has brown hair in dreads that are always under a baseball hate, he has a skater-grunge style where he wears oversized clothes, he's pale, and has the perfect symmetrical face like Bill since they are identical. He has a lip piercing on the right side of his bottom lip.