List of Sister, Sister characters

Minor characters[]

Denise Mondello (Anna Slotky) – Denise is one of Tia and Tamera's friends who appears in the show's second and third seasons. Denise, like Tia and Tamera, was employed at Rocket Burger. In the season two episode "Single White Teenager" (the characters first appearance in production order, though she appeared in an earlier episode in season two), Denise was paired with Tamera as a science partner while Tia was sick, and later started to dress like Tia and Tamera as well, even claiming she was going to start being called by her middle name of Tonya in order to match theirs, causing panic by Tia and Tamera, only to find out that it was a joke. The character is one of only two recurring characters from the show's ABC run to appear on the show during the show's run on The WB, Dorien Wilson's Terrence Winningham is the other.
Steve (Steve Monroe) – Steve is one of the twins' guy friends in the third season, who is depicted as being not very bright and is revealed in the episode "The Tutor" to be a player on Roosevelt High's basketball team.
Ernie (Arvie Lowe, Jr.) – Ernie is one of Tia and Tamera's guy friends in the third season, and is revealed to be a drama club member in the episode "Private School".

Carl Mitushka (Fred Willard) – Mr. Mitushka is the vice principal of Roosevelt High and the founder of a conservatory for young musicians. In his last two appearances, he tries a bit hard to "be cool" with the students. The character appears in the season three episodes "The Piano Lesson", "The Candidate" and "The Audition".
Dave Barnes (David Strickland)- A Security guard at the mall where Lisa works. He is often shown to be slightly incompetent and loses his job in one episode.
Mike (Jamil Walker Smith) – Mike is a student at Roosevelt High, seen only during the fourth season, who is also one of the very few male friends Roger is seen to have, presemably as he is most likely in the same year as him.
Dot (Senta Moses) - Dot is a friend of Tia and Tamera's during season five.
Victor Sims (Richard Lawson) – Victor is one of Ray's friends, who later becomes Lisa's love interest and later her husband in the series finale. Due to the series ending, we will never know if Victor adopted Tia. Richard is the father of Bianca Lawson, who played Rhonda in the third season.
Steven (Chad Haywood) – Diavian's boyfriend in season five, who is shown not to be very bright.