This is a list of characters from the Nickelodeon/Disney animated television series Doug.

Main characters Douglas Yancey "Doug" Funnie (voiced by Billy West in the Nickelodeon series and by Thomas Lyons, credited as Thomas McHugh, in the Disney series) is depicted as an unlucky, average, self-conscious, naïve, and occasionally sensitive 11-(later 12)-year-old boy who wants to fit in with the crowd, but is very creative and imaginative, and has a strong sense of right and wrong, making him more likely to stand out. He has a talent for writing and he plays a banjo in his spare time. Doug narrates every episode, and writes his experiences in his journal. His alter ego, Quailman, was inspired by Jinkins' and Roberts' home movies as children, posing as superheroes. Billy West, the original voice behind Doug, was assigned by executive Vanessa Coffey, to Jinkins' initial reluctance. Despite this, he would come to view it as the best possible voice for the character. West, in recording lines for Doug, noted that "There's a lot of me in there, because I'm going through my own experiences in there, because I have a conscience." Quailman is Doug's superhero alter ego, harnesses the powers of the quail. Often accompanied by his sidekick, Quaildog (Porkchop). Smash Adams is another alter ego of Doug's, a British spy agent parodying James Bond. Race Canyon is a seldom-seen alter ego, an adventurous archaeologist parodying Indiana Jones. Doug dresses as him for Halloween in "Doug's Halloween Adventure". Porkchop (voiced by Fred Newman) is Doug's anthropomorphic 4-(later 5)-year-old pet dog and sidekick who accompanies him nearly everywhere he goes. He sometimes assists Doug in making decisions and acts as his conscience. He is also very talented in many things such as acting. He lives in an igloo-shaped doghouse in the Nickelodeon series, and a tipi in the Disney series. During a Christmas special it shown that Doug got Porkchop as a Christmas gift and that Porkchop once saved Beebe Bluff's life when she was about to fall through some thin ice. Porkchop, along with Doug, originally first appeared in ID spots for the USA children's block, USA Cartoon Express. Mosquito "Skeeter" Valentine (voiced by Fred Newman) is Doug's blue-skinned best friend. He is part of Doug's main circle of friends in both the Nickelodeon and Disney series. He is famous in both series for the honking sounds he frequently makes. As Skeeter and his family have lived in Bluffington for some time, he initially helps Doug order food from the popular Bluffington restaurant Honker Burger in the series premiere (resulting in their friendship), and later helps Doug learn how to dance. He and Doug are fans of the rock group The Beets (based on The Beatles, The Who, and The Rolling Stones). Skeeter also occasionally works as a DJ. Although he is at best an average student, he is highly intelligent – he once got a perfect score on an IQ test, leading him to contemplate leaving elementary school for college (for which Doug resented him, until Skeeter decided not to go, since his would-be college classmates smoked and disdained things like air guitar). The character was based on Jinkins' high school best friend, Tommy Roberts. Patricia "Patti" Mayonnaise (voiced by Constance Shulman) is Doug's orange-skinned love interest and closest female friend. She is another character part of Doug's main circle of friends. Patti is a star athlete with a Southern drawl, multiple talents and popular with her classmates. She is usually kind and helpful towards others but is not without her faults, namely a tendency to be very competitive, being gullible, and to get easily angered if pushed too far. Jinkins based the character on his adolescent crush from junior high to high school, and culled her name from two girls from his childhood, Pam Mayo and a girl named Patty. Her mother died when she was a little girl in a car accident that left her father paralyzed from the waist down. In the final episode she asked Doug out on a "date date". In the early 1990s, Shulman appeared in a series of Kraft mayonnaise commercials. Roger M. Klotz (voiced by Billy West in the Nickelodeon seasons and by Chris Phillips in the Disney seasons) is Doug's green-skinned archrival and the town's local school bully and thug. He is a source of anxiety for Doug and his friends. He's older than others in his class, as it took him three years to graduate from sixth grade. Roger and his divorced mother lived in a trailer park in the Nickelodeon series; in the Disney series, Roger's family becomes wealthy from a real-estate deal struck between the owner of the trailer park and the Bluff family. Roger's character was based on a real bully who lived in the same neighborhood as Jinkins. He adopted the bully's neighbors' last name, Klotz, for the character. In "Doug's Worst Nightmare" it is revealed that Roger has a crush on Judy. He tries to skate, learn Shakespeare (with misplaced words and malapropisms) and plays music to win her love. After he is rebuffed, he moves on as he saw that she wasn't really what he wanted. In "Doug's in Debt" after Judy takes her Napoleon hat back from him he says smiling, "she sure is forceful" hinting he still loves her. In "Doug Gets Booked" she even kisses him. Roger secretly takes ballet lessons and hopes to have his own gas station someday. He has also expressed interest at purchasing his own cow. Roger successfully put together a garage band in "Doug's No Dummy" called "Roger and the Ulcers". Roger is occasionally shown to not be as tough as he lets on – he is afraid of snakes, which Doug briefly contemplates using against him as payback for his bullying, and he is left virtually speechless in the episode "Doug Throws a Party" when Connie punches him in the gut and calls him a big baby when he teases her about her bad haircut. The relationship between Doug and Roger in the Disney series becomes more similar to that of Bart Simpson and Nelson Muntz from The Simpsons: Roger, though still continuing his role as the school bully and thug, becomes less antagonistic towards Doug and acts as more of friend towards him (even to the point where he actually replaces Connie in Doug's main circle of friends, though that was likely a writer choice more than a character choice), although Roger is still prone to bullying him and, when doing so, is shown to be more prone to ridicule and verbal humiliation rather than obnoxious pranks. Roger's pet is a magenta-furred cat with a white muzzle named Stinky, who follows him around almost everywhere Roger goes and the cat seems to be the counterpart to Porkchop as Roger is to Doug—well, Roger is Doug's bully anyway; and Roger's pet being a cat may be to shadow the fact that Doug's pet is a dog. Roger is somewhat of a stereotype of a school bully and thug to Doug since he will only address Doug by last name. Beebe Bluff (voiced by Alice Playten) is the stereotypically spoiled heiress to the Bluff family fortune and one of Doug's friends. She is also part of Doug's main circle of friends. Beebe is the daughter of Bill Bluff, the richest man in the town and a friend of Mayor White. The Bluff family is the namesake of the town of Bluffington, and in the second series, the school is even named after Beebe. Despite a certain air of superiority over her peers, Beebe maintains friendships with Patti Mayonnaise and most of her other contemporaries. Doug had his first kiss with her in the episode Doug's Secret Admirer, although it was out of gratitude rather than love, since she already has a crush on Skeeter. Judith Anastasia "Judy" Funnie (voiced by Becca Lish) is Doug's older sister and the extrovert of the family, she is obsessed with the works of William Shakespeare, and is an aspiring actress and artist who attends a special art school for gifted individuals. She is embarrassed by how "boring" her family is compared to her friends and classmates. She and Doug have normal bouts of sibling rivalry, but usually put it aside whenever faced with a problem and deeply respect each other. She affectionately calls her brother, "Dougie." She is a beatnik that is always seen wearing a beret and dark glasses. Judy was inspired in name from Jinkins' first girlfriend, and in appearance from his wife's sisters. In recording her character, Lish would provide lines as written, and then provide several more takes incorporating improvisation into her lines.Klickstein, Matthew (2013). Slimed!: An Oral History of Nickelodeon's Golden Age. New York: Plume, 320 pp. First edition, 2013. She is Roger's love interest although she does not return it and rebuffs his affections with an eloquent Shakespearean poem. However, she actually kisses him in "Doug Gets Booked" implying she has romantic feelings for him after all.

Recurring characters Chalky Studebaker (voiced by Doug Preis) is a friendly and helpful school jock with light green skin, who is part of Doug's main circle of friends in both series. Chalky wants to follow the footsteps of his older brother, Cliff, whom he is often compared to. He comes from a family to whom winning "just comes naturally". This can put him under pressure at times along with his extremely busy extracurricular schedule. Connie Benge (voiced by Becca Lish) is a sweet and naïve schoolgirl who is Patti's best friend, Beebe's closest friend, and also one of Doug's friends. In the former series, Connie was shown to have a small crush on Doug, although he does not return any of her feelings, and only considers her a friend. This relationship with him remains in the Disney series, though she also tries to develop a similar relationship with Roger. Although she was rather heavy-set in the first series, she lost weight between the two series, grew taller than both Patti and Beebe, and got a new wardrobe and hairstyle after visiting a beauty farm, making her look quite different in either show. During the first season on Nickelodeon, she had purple skin and blond hair, and was never mentioned by name until the second season, when she was changed to have pea-green skin and dark-blue hair. Bud Dink (voiced by Fred Newman) is a slightly eccentric, purple-skinned, dimwitted writer who lives next door to the Funnies with his wife and foil, Tippy. Doug frequently goes to Mr. Dink for advice, but sometimes it is useless. He also tends to purchase things that are "very expensive". His and his wife's last name comes from an acronym: Dual Income, No Kids. Tippy Dink (voiced by Doris Belack) is the deadpan but intelligent and always well meaning wife of Bud Dink. In later Nickelodeon episodes, Mrs. Dink becomes mayor of Bluffington, a role she continues in the Disney version. Theda Funnie (voiced by Becca Lish) is Doug, Judy, and Dirtbike's mother, generally portrayed as a housewife, but sometimes a working mother too. She manages the Deja Vu Recycling Center. Her skin is slightly brighter than Doug's, her hair is blue, and is shown to be rather meek, but also an outgoing environmentalist. Phil Funnie (voiced by Doug Preis) is Doug, Judy, and Dirtbike's father who works as a photographer for the Busy Beaver department store. He quit to start his own studio toward the end of the Nickelodeon series, but then decided to go back to his old job because running his own business was too stressful and took time away from the family. His personality is friendly, outgoing, and sometimes clumsy. His skin has a hint of orange, and he can be seen giving Doug advice, most of which is relatively useless. He is shown to be a very skilled kite maker.