Billy Sheehan is the bassist for the band and is the main character in this plot. His full name is William Sheehan (middle name is either non-existent or unknown) but is preferred to be called Billy. Billy is known as a legend in bass, he had been in many other famous bands which gave him a welcoming reputation as a legend for his skill. Billy is 39 years old and born on the 19th of March, his birthday had already passed so he had turned 39. He is a Pisces giving him the friendly, intuitive, creative and possible introverted side of his personality. Billy isn't an asshole but since he is Pisces it can be inferred that he is the emotional kind. He isn't egotistical and doesn't compare the women he likes to other women, he treats them with respect. When his mad he does get an attitude but he is mindful of others. Billy is a tall, broad shouldered and athletically built (meaning he is lean but has muscle). His hair is usually seen blonde (sometimes dark at the roots), past shoulder length and teased (which is an in thing for the era). He does wear hats occasionally and does toe back his hair in a pony tail. He can be seen wearing jackets, tank tops, skinny jeans, leather pants, boots and general shoes (can even seen in platforms but not for Mr. Big), or straight up shirtless. Billy as a tattoo on his left upper arm and another on his left lower arm, can be seen with a tattoo on his chest more so on the right. He does wear necklaces and scarfs around his neck. Billy is more of a cat person than a dog person, you can see images of him with a cat more than a dog.

Eric Martin is the singer and frontman of the band. Eric is a silly and expressive man with a kind and loving nature. He is humble and doesn't have an ego, that just means he doesn't get arrogant). Eric loves his fans and is quite extroverted, so he'd just talk to anyone. He is friendly to those he has a conversation with. Eric has dogs, he is more of a dog person than a cat person. Eric tends to wear the usual rock star style as well as his colourful and loud button up shirts. He is in his 30s, born on the 10th of October. That means he is Libra. Eric is a tall, broad, and athletically built. He is often seen with wavy or curly brown hair (the hair style would be a perm). He is occasionally seen with black hair (he might have dyed it at some point). He has brown eyes and a fair complexion. Eric has a wife, so he's married, that means he doesn't flirt with anyone or try to court anyone.

Paul Gilbert is the guitarist of the band. He is pretty professional at guitar and has also been in bands previously before Mr. Big. Paul has a rock star style like the rest of the band. He has brown hair and relatively brown eyes. Height is unknown but he is athletically built, not skinny as a twig. He seems to have a silly and friendly personality, although most photos you see with him in it he has a resting face that makes him look angry when he's not. He also seems to be extroverted. Paul could be around 30-40 years of age but looks rather young. He is also married like Eric is.

Pat Torpey is drummer of the band. Pat also has a reputation doe being part of other bands previously of Mr. Big. Paul seems to be extroverted by how expressive he seems to be in music videos. He does seem to be friendly and more athletically looking. It has been said by Eric in an interview that Pat has been known for working out before performances. He also has the rock star style but more casual than loud. He has dirty blonde hair and blue eyes, he is broad and has a more muscular build. Height is unknown. Pat could be around 40s, he is one of the older band members with Billy. Pat's full first name is Patrick, more so known as Pat and it is preferred to be called that. Pat has a wife, so he's married.

Jane Glover is 34 years old. She is Guest's roommate with a bubbly and kind personality. Jane has long brown hair that's past her shoulders, she also has brown eyes and a tan complexion. Jane loves to listen to Mr. Big, with Guest, in the car or at home.