Bob's Burgers introduced viewers to dynamic and hilarious characters from the very beginning. These characters have bold personalities and create memorable storylines that keep viewers coming back for more. However, many of the characters that fans adore, like Rudy or Tammy, were not seen on the series until after season 1.
The memorable characters that first appeared in later seasons helped push the storylines further into unexpected places, and many of them developed strong connections with the Belcher family. Even though there are many characters that have been added to the show over the years, there are some that are better than the rest and have made a bigger impact on the series than others.
Dr. Yap
Dr. Yap is the dentist to the Belchers and makes his debut in season 2. He expresses his interest in dating Gayle and invites the Belcher family with him on a skiing trip so he can attempt to become Gayle's romantic partner. Dr. Yap also makes later appearances. In one episode, he is a member of a fraternity that Bob cooks for. In another, he attempts to catch the Belcher children after they rip a page out of a magazine in his waiting room.
Dr. Yap is a fantastic addition to the series because he adds a new comedic layer to the series while also having a unique personality. Dr. Yap also ends up becoming a slight antagonist to the Belcher family in his later appearances, further showcasing how dynamic he is.
Logan
Logan is an antagonist to Louise who is introduced in season 3. He and Lousie become enemies after he steals her notorious bunny ears and refuses to give them back. Logan makes similar appearances in the series later when he and Lousie continue their mutual hatred for each other.
Logan's introduction to the series not only gave Lousie someone whom she could occasionally bicker with, but it also created a character that she develops an odd friendship with. They may fight with each other, but the pair do get along when they have no other option. Logan and Lousie's dislike for each other is prominent in the series, and Logan's mother and Linda also become enemies as well.
Millie
Millie is another antagonist Louise encounters, and her constant obsession with Louise keeps fans on their toes. Millie makes her first appearance in season 4 during a Halloween episode in which she pushes for Louise to wear a couple's costume with her. However, Louise rebuffs her, and Millie retaliates by leaving the Belcher kids and their friends trapped in their fort.
Millie is definitely a nuisance to Lousie, but she also proves to be a formidable foe that Louise must face. Millie is a valuable character in the series because of her rivalry with Louise and her consistent trouble-making ways. Lousie also seems to be afraid of Millie during their numerous interactions, making it prominent to fans of the show that she is a force to be taken seriously.
Josh
Josh is introduced in season 3 as the mystery milk shopper whom Tina swoons over. Josh and Tina's brief romance is carried over when he makes his next appearance later in the season wgen he asks Tina to go to his school dance with him, sparking a love triangle between him, Tina, and Jimmy Jr.
Josh's character is important because he is a love interest to Tina and eventually becomes good friends with her. Josh is similar to Jimmy Jr. in the fact that he is a passionate dancer, and the only major difference between the two is Josh's undeniable infatuation with Tina. Josh also has an odd personality that meshes well with Tina's, making him one of Tina's best boyfriends on Bob's Burgers.
Darryl
Darryl is another hilarious character that made his debut in season 2 when he helps Bob master the video game Burgerboss. Darryl makes appearances in later episodes, tagging along on the Belcher kids' adventures and is even in a band with Gene during one episode. Darryl and Tina also pretend to be boyfriend and girlfriend in order to make the people they have crushes on jealous.
Darryl's intelligence on Bob's Burgers ranks him among one of the more important characters introduced after season 1. Darryl is a master planner, and Lousie, Tina, and Gene use that to their advantage whenever they can. Darryl also has a unique personality that made him a standout character right away.
Courtney
Courtney is Gene's on-agin, off-again girlfriend who has become a well-known character since her first appearance in season 3. Courtney starts out as annoying and pressures Gene into being her boyfriend after she develops a crush on him. Courtney eventually becomes another rag-tag member of the Belcher kids' friend group, and she defends Gene from her overbearing father on a few occasions.
Courtney is an important reoccurring character because of her friendship with Gene and the occasional romantic interest they share. Courtney also adds hilarious moments to the series, and her ability to mesh well with the other Belcher children makes her a valuable asset.
Mickey
Mickey is a bank robber who took Bob as a hostage in season 2. Since then, he's appeared in numerous subsequent episodes and has become a major recurring character. After Mickey is released from jail, Bob hires him to work in the restaurant, but he is caught trying to tunnel into the bank next door. Mickey moves on from crime and becomes a ride operator at the amusement park owned by Mr. Fischoeder.
Mickey is a great addition to the Bob's Burgers universe and has proved to be a valuable side character. He gets along with each of the Belchers, despite having held Bob hostage when they first met, and he even helps Louise when she tries to make loads of money selling ambergris.
Felix
Felix is the bratty younger brother of Mr. Fischoeder and is introduced in season 4. He is less confident than his older brother, and his personality shows his immature ways. Mr. Fischoeder takes on his protective older brother role by allowing Felix to do odds jobs like remodeling Bob's restaurant's bathroom.
Felix also becomes an antagonist in later episodes after he kidnaps Bob and Mr. Fischoeder and nearly kills them, but he eventually apologizes for his behavior. Felix is a valuable character addition because of his crazy plans that lead to outrageous situations. Felix is also important to the series because of his relationship with his older brother and how that affects the other characters.
Rudy
Rudy was first introduced in season 3 and has since become a close friend to the Belcher kids. Rudy, nicknamed Regular-Sized Rudy, has appeared consistently since his introduction and has a mellow attitude that meshes well with the Belchers. Rudy steps out of his comfort zone often to join in with Louise, but also has shown that he is able to stand up for himself when he needs to.
Rudy's laid-back personality and go-with-the-flow attitude make him a valuable friend. He is almost always on board with whatever plan Lousie comes up with, and has a close friendship with both her and Gene. Rudy is also the closest friend Lousie has besides her siblings, and she never does anything to harm him outside of occasionally teasing him.
Tammy
Tammy makes her debut in season 2 when she and Tina become friends. Tammy pushes Tina to do bad things, and the pair eventually end up having a falling out. She becomes friends with Jocelyn in later episodes and makes regular appearances in the series.
Tammy is one of the best additions to the series after season 1 because of her ridiculous antics and villainous behavior toward Tina. She has become a major character in later seasons, solidifying her spot in the series as the main antagonist for Tina and the other Belcher kids.