Like its parent show, Angel has many highly popular secondary and minor characters.
- Doyle only appeared in nine episodes, but is very fondly remembered. There are a lot of tie-in novels covering those additional few months where the agency was just him, Angel and Cordelia. Joss even intended to bring him back in Season 3 but Glenn Quinn's sudden death put a stop to those plans.
- Darla with regards to the parent show. She appeared only in three Season 1 episodes and made a cameo in Season 2. But upon being featured more and more on Angel, she became a fan-favorite. Her arc with Drusilla in Season 2 is held up as one of the strongest on the show.
- Skip. He was so popular in his debut appearance in Season 3 that he was brought back for 3 more episodes. Joss Whedon has mentioned that he finds Skip to be among the coolest demons in the series, at least in design
. - Faith's Character Development in this series is well-appreciated and adds to her status as this from the original series.
- Lindsey and Lilah tend to get praises for their complexity and often appear on lists of the series' best characters. Separately, Lindsey is liked for being a good rival and Foil to Angel, while Lilah is beloved for being a Manipulative Bitch Deadpan Snarker.
- Noble Demon Boone from "Blood Money" has his fans for being a decent fighter with a Friendly Rival relationship with Angel who helps scam Wolfram and Hart in a hilarious and convoluted way.
- The demons from "The Ring" have their fans, particularly Trepkos, for being a stone-cold badass with some Hidden Depths and a cool appearance who faces Angel in one of the show's more impressive and evenly matched fight scenes.
- Tina, the Broken Bird Decoy Protagonist from "City of..." is pretty well-regarded. Some wish she'd gotten to live past her first episode.
- Gwen Raiden, the Stripperific hired gun with electrical powers has plenty people who wish she'd been in more than three episodes and some sequel comics that display an extremely poor grasp of her prior character.
- Matthias Pavayne is considered one of the most terrifying villains despite only appearing in one episode. Which is really saying something given the various Big Bads and Dragons he has for competition.
- Wolfram and Hart's chipper records and files keeper also named Gwen, is considered a memorably quirky part of "Dad". Being played by the star of the Progressive commercials helps.
- Ilona, head of Wolfram and Hart’s Roman office was only in "The Girl in Question", but has her fans for some funny interactions with Angel and Spike and being one of the more outgoing and less treacherous members of the firm.
- Dana the Slayer only appears in one episode, "Damage", but she is much more memorable to the fanbase than most Monster of the Week characters for being an interesting kind of fallout from the events of Buffy Season 7. With all potential Slayers activated, what would happen if even one of these extremely powerful girls were emotionally and psychologically disturbed? Dana answers that question in her episode, and even forces Spike to more seriously confront his horrible actions in the past.
- The dragon that Angel and his allies see among their approaching attackers in the Bolivian Army Ending only appears for a few seconds, but inspired a lot of interest and delight from fans even before becoming a temporary friend and companion of the team in the sequel comics.
- Mildred Finster, who has an engaging Little Old Lady Investigates plotline in the tie-in novel Solitary Man, is one of the better-liked characters exclusive to the show's expanded universe.
- Sewer-dwelling Gentle Giant Abner and vampire Miss Kitty Dyanna are two of the better-liked guest characters from the short-lived Dark Horse Comics series that premiered at the same time as the show.
- Cursed painter and old acquaintance of Angel Gabriel Dantz only appears in the novel Image and isn't physically present for much of the book, but he has a respectable fanbase.
- The respective leaders of the two different but equally mysterious and impressive demon tribes (the earthquake-causing Temblors and the Serpentene clan of businesspeople) in the novel Shakedown are both better remembered than the average expanded universe guest character.
