Girlfriend: Girlfriend is the deuteragonist of Friday Night Funkin'. She is Boyfriend's partner and the daughter of Daddy Dearest and Mommy Mearest. She is usually seen sitting on top of a stereo, bopping her head to the tempo of the music, cheering Boyfriend on, and keeping track of combos. She is the first opponent faced as she teaches the player how to play the game with her only track, Tutorial. Girlfriend is a young 19 year old woman with light skin and long, thick brown-auburn hair. Two short locks of hair stick out of her head, one being much smaller than the other, and the shine on her hair resembles a skull. She wears a sleeveless red minidress and matching high heels. Her fingernails are painted red, as shown in her singing animations, where she points with both hands in the direction of the arrow note being hit, although sometimes this detail is not added. She normally sits with her legs crossed on a large gray speaker, with two smaller gray speakers laying beside the large one. She is drawn in a chibi style. Girlfriend is portrayed as a young, mysterious woman. With a love for cherry soda and her boyfriend, she seems to be calm and collected in almost any situation, even in the face of death. Being a demon, she seemingly possesses a great deal of power, but she mostly chooses to hide it. She is always seen with Boyfriend at her side, courtesy of true love, as she genuinely loves him very much. Like Boyfriend, Girlfriend lacks intelligence to the point of being unafraid of almost anything. In general, she either does not realize when she is in danger or is confident that she can get out of such situations, which may also be due in part to the power she has. Her lack of intelligence can result in her getting into difficult situations, such as getting her hand stuck in peanut butter jugs and having to wait for hours for someone to help get it out. However, she is still capable of making smart decisions and knows what to do when dealing with taxes[8] and facing death. Girlfriend has been diagnosed with attention deficit hyperactivity disorder (ADHD) and autism. The only individual she has been shown speaking to is Boyfriend. In Week 6 and Week 7, she does not speak at all, and she seems to barely acknowledge the opponent, if at all. Furthermore, she occasionally has poor object permanence. Girlfriend's talents as an artist and painter show that she is a creative individual. She has a poor concept of time, too, which is a common ADHD trait. She doesn't know very well how to handle money, either; she will normally make commissions (due to being an artist), but she will ask for 1 trillion dollars, or when she has to pay for a hamburger, she will pay less than what the hamburger costs.[12] Girlfriend has been described as being mean "in her own special way." She also likes to do immoral things, appearing to not care about the consequences of her actions as long as she gets what she wants. For instance, using her mother's limousine, she and Boyfriend hold up McDonald's drive-through slots as they hold the store hostage to get whatever food they want. She is the girlfriend of Boyfriend and her parents are Mommy Mearest and Daddy Dearest.

Daddy Dearest: Daddy Dearest is one of the main antagonists of Friday Night Funkin'. He is the demonic ex-rockstar husband of Mommy Mearest and father of Girlfriend, and he attempts to eliminate his daughter's boyfriend by any means possible, as he does not approve of the relationship between the two. Daddy Dearest has a demonic-looking appearance with lavender skin, black eyes with red glowing pupils and grayish-lilac hair vaguely shaped like a demon's horns. He wears an open black suit jacket without a shirt that reveals his gray chest and pubic hair; black pants held by a belt with a golden buckle; black heeled dress shoes; and a silver watch on his left wrist. He has some stubble on his chin and wrinkles on his forehead. He holds a bluish-gray microphone in his left hand while keeping his arms crossed. His idle animation has him bopping his head. Daddy Dearest is selfish, cruel and uncaring, as he has attempted on multiple occasions to kill Boyfriend without caring about the consequences it will have on his daughter. As a performer, he is weirdly prideful and condescending. He also appears to be somewhat petty, as he hires Pico to kill Boyfriend after the latter beat him in Week 1. However, he is not as ill-willed as his wife Mommy Mearest, who has been stated to be far worse than Daddy Dearest. Once, he let Boyfriend enter his home just to use a voodoo doll of the same to torture him just for fun, showing he enjoys the pain of others, or Boyfriend in this case. His wife is Mommy Mearest and his daughter is Girlfriend.

Mommy Mearest: Mommy Mearest is one of the main antagonists of Friday Night Funkin'. She is the demonic pop star wife of Daddy Dearest and mother of Girlfriend, and she attempts to kill Boyfriend by any means possible because he is dating her daughter. Mommy Mearest has a demonic-looking appearance with purple skin, black eyes with red glowing pupils and long, volumized auburn hair with several pointed ends and a curved cowlick. She wears a form-fitting red dress underneath a black jacket, black thigh-high heel boots, a black garter belt, golden hoop earrings, a golden necklace and a pair of golden bracelets on each wrist. She has dark red lipstick on and sharp, red-painted fingernails. She clutches a bluish-gray microphone in her right hand but will sometimes hold it in her left while singing. Mommy Mearest is a skilled pop singer who seems to be powerful in terms of both abilities and status. She is condescending and prideful as a performer, being even more evil than her husband. As a parent, she is just as overprotective as Daddy Dearest, if not more so, as she makes multiple attempts to put Boyfriend's life in danger because he is dating Girlfriend. She is short-tempered, as she brutally stabs her husband with multiple knives for inadvertently knocking her music speakers into the bathtub and electrocuting her after throwing Boyfriend against the wall from using his figurine as a voodoo doll. Her husband is Daddy Dearest and her daughter is Girlfriend