The title character of Ćon Flux runs around doing spywork and sabotage in outfits ranging from a skintight catsuit to a vinyl thong bikini and stripper boots. Aeon's appearance was originally conceived as a parody of unrealistically StripperifficAction Girls.
The famous, sexy, blonde nurse, Hello, Nurse! is one of the classic examples, serving as the current page image. Hello Nurse's appearance almost always prompts Wakko and Yakko into exclaiming "Hellooooooo, Nurse!", (one of the show's well-known lines) and jumping into her arms. She also appears in some short as hostess, maid, Femme Fatale, etc.
While Widow was shown to be this in the 1st season, but she was most definitely fan service in the second season.
In the second season, she has long, beautiful hair, a curvy beautiful eyes, and an improved body physique. Through her skintight cat suit(which receives highly detailed animation), her entire body shape, physique, and appearance is shown to be more voluptuously muscular and attractive than her season one appearance; Her arms are more muscular, Her breasts are more endowed, and Her legs are also shown to be more long, yet voluptuously muscular through her 2nd season costume.
In Beneath the Surface, Widow (along with Hawkeye) wore an aquatic version of her costume that allows for her to breath underwater and just like her 2nd season costume, the suit still presents the muscular yet voluptuous build for her body.
Poison Ivy. One of her main features as a villain is her seductive ability.
Roxy Rocket. Has a nice figure and provides cleavage.
In Ben 10, Gwen was a 10-year old girl and thus a Pettanko, and her teenage nemesis, Charmcaster, wore a coat that revealed no cleavage. In Alien Force and Ultimate Alien, however, the two are all grown up, with noticeably bigger breasts, Gwen having several scenes in swimsuits, and Charmcaster wearing a much form-fitting outfit. Although he may've just been mocking her, Ben said that she always had a big butt.
Cleo from 'Clone High is portrayed as seductive, hedonistic and libidinous. She often wears skimpy outfits and her regular outfit is a white tank top which shows her large cleavage and a tight black miniskirt to show her voluptuous figure.
Élisabeth "Sissi" Delmas is Ms. Fanservice in Code Lyoko. She's the one most often seen in some underwear, swimsuit or panty-shot scene. And yes, it's a kid show... but a French one.
Magica De Spell from DuckTales, as admittedly intended by Carl Barks. She is noticeably more attractive than most female characters on the series, but she becomes curvier than usual when she disguises herself in "Magica's Magic Mirror".
Futurama's Turanga Leela and Amy Wong both take turns at fanservice from time to time; about the verybusty Leela her standard outfit consists of skin-tight tanktop and pants, her other "ordinary" outfits (such as formal dresses and swimsuits) invariably have a midriff window showing her belly button, and she's the most likely to be seen wearing strange, Stripperiffic outfits. She's also the second-most-likely to get naked, after Professor Farnsworth. Amy, aside from her regular pink tracksuit outfit, wear very skimpy outfit for every formal event (even a funeral) and often appears in bikini. The creators acknowledged in a commentary at one point that Amy was a sex symbol to the fans, joking that there was a fansite called Can't Get Enough Amy.
The Baroness was probably the closest that G.I. Joe came to this (there's a reason she has a trope named after her) and some of her outfits were pretty risqué for a cartoon of the time. The most blatant example was one episode where she wore a bikini for the entire episode. (Not by her choice. Plot-wise, she, Cobra Commander, Flint, and Lady Jay were kidnapped by a third-party villain and forced into a Deadly Game, and in her case, she was in a spa at the time when she was grabbed, and had no way to change. Still, it was obviously an intentional move by the writers. In one scene in said episode, Flint ends up grappling her in a struggle that ends with a pin; seriously.)
Justice League Unlimited has so many examples that exceptions (such as Amanda Waller) are far easier to list. The major are:
Wonder Woman. She get the majority of Male Gaze in the series. The second episode, "Secret Origins" part 2, features Wonder Woman pretty obviously getting naked when she drops her robe to put on her costume. In "Dark Heart," The Atom gets a ride to the fight in Wonder Woman'scleavage.
Black Canary. A blonde heroine who is s dressed like a cocktail waitress. Her character design has to be the most obvious Fanservice of the series. Her initial conversation/sparring session with Green Arrow in "The Cat and the Canary" — sans jacket — is jaw-dropping, all blonde hair and curves flattening on the mat. She lets him get on top of her and pin her arms behind her back, to convince him to do her a favor. Really, any episode with Canary in it is made for fanservice.
Huntress. She doesn't get the amount of in-universe attention that Wonder Woman or Black Canary do, but the camera does develop Male Gaze when she's in an episode.
Giganta. She has a buxom figure, especially compared with Killer Frost in the Secret Society, and wears a tiny dress. Only the Magic Skirt trope avoid Panty Shot, even when she falls over. She attracts a few men in the show ( included Flash).
Shego from Kim Possible. Out of all the female characters in the series, she's the one whom most often seems to be depicted in states of undress (i.e. relaxing in bathing suits in the middle of Drakken's lair or on private resorts) or seen using her sex appeal in some way (distracting Martin Smarty).
From Littlest Pet Shop (2012) the Biskit twins. In the second episode, they dress in form-fitting Cat Girl outfits for camouflage, and their general design seems to invoke this.
Invoked in one episode of Megas XLR. While at a shopping mall, Jamie tries to get Kiva to wear a bunch of goofy and embarrassing outfits (including a punk-rocker chick outfit and pyjamas) as a petty joke on his part. However, Kiva just ends up provoking a different reaction from onlookers and the prank backfires.
One of first example is Red from Red Hot Riding Hood, a nightclub singer and dancer who is usually making all men in the room crazy, especially a Wolf character who - in vain- tries to seduce and chase her. Characters like Hello Nurse and Jessica Rabbit are inspired most from her.
In Seth MacFarlane's show, usually, one of the main characters, a family member, fits the role:
Family Guy has Lois Griffin. Some episodes will have her dressing revealingly or in underwear.
Of recurring characters, the Dumb Blonde Jillian. An example: when Brian go to break up with her, he find her with a Modesty Towel that she use for the hair exposing her entire body naked.
American Dad! has both mother and daughter, Francine and Hayley Smith. For Francine, special mention goes to "My Morning Straitjacket" in which she got Stan backstage by showing off her body to appease all of the guards and "Best Little Horror House in Langley Falls" where she spend half of the episode in underwear.
The Cleveland Show has Roberta Tubbs. Portrayed as a sexy teenager, she often wears skimpy clothes.
Tabitha Vixx from "Marge and Homer Turn a Couple Play", an actress and Shameless Fanservice Girl. So much so that in her show a sign warns "first ten rows may get horny".
Titania from "Pygmoelian", a blond buxom woman. In the "Beer–Tender of the Year" contest she pulled out all the stops in using her Gag Boobs to increase her chances of winning.
Sara Sloane from "A Star Is Born-Again". She wears revealing fashion and nearly act in topless roles for a romantic film.
Julia, the Yandere fan of Homer from Homer Of Seville. When she reveals her true intentions to Her, she strip naked and says him that can have her anytime he wants. Over the next few days, she keeps appearing in sexually suggestive positions.
Marge herself in "Large Marge", in which she was accidentally given breast implants and become a model, and in "The Devil Wears Nada" after sexy pictures of her end up on a charity calendar. Several Halloween special have Fanservice scenes with her also. In Real Life she appeared on Playboy posing semi-nude!
The 6teen writers certainly loved having Jen get caught either shirtless or nude, though this was censored accordingly.
Star Wars: The Clone Wars has had many female characters fitting this trope including Aayla Secura, occasionally Padme, and Ahsoka also seems to be getting there, but so far the fanservice incarnate of the show is definitely Suu Lawquane, by the sheer amount of fanservice-related tropes she embodies all at once.
Lois Lane, a major example of an animated Hot Scoop. She receives more Male Gaze on her legs and mini-skirt.
Supergirl has an hourglass figure despite her age and wears Bare Your Midriff costumes.
Mercy Graves, Lex's bodyguard who wears a ridiculously short dress . She gets even more Fanservice after her design change in Justice League, to the point where the android, while channeling Flash, hits on her.
Sym-Bionic Titan has Kimmy Meisner. She's got plenty of curves, dresses provocatively and shows it off.
Starfire. Her usual outfit is a crop top, miniskirt, and thigh high boots. This is especially apparent next to Raven, who is usually hiding in her cloak. However, it's much more downplayed in comparison to her comics counterpart, who had a far skimpier outfit and a supermodel body.
Raven. She's well endowed, wears a skin-tight leotard under her cloak and getting her clothes ripped off briefly during the Trigon arc. Which is a complete 180 from her original comic interpretation as a small-chested, demure girl who didn't really get normal people.
Julie Bruin from Tiny Toon Adventures, a cute anthropomorphic female bear with a really big bust that bounces with almost every movement she makes. It is the main reason why fan remember her despite appears only in one episode.
In Total Drama, several of the female contestants qualify, but Lindsay and Heather stand out.
Lindsay's got large breasts, wears a tank top and short skirt, and in one episode even dresses up like an admiral. And Wonder Woman!
Heather has many Shower Scenes and appearances in a Modesty Towel during the first season. Plus, her boobs were shown in "X-Treme Torture", and her butt was shown (uncensored no less) in "3:10 to Crazytown".
The producers seem to love the Male Gaze trope, especially with Courtney. She gets a bunch of butt shots for no other reason besides Fanservice in every season in which she participates.
Dakota and Zoey (that, like Courtney, gets a fair amount of Male Gaze) serve in this role for the second generation cast.
The Asian Sisters, Emma and Kitty, in the spinoff. Both are shown in bikinis twice and Emma gets several butt shots also.
The three main characters of Totally Spies! with frequent Male Gaze. About half the camera shots are focused on the girl's breasts as they are about to speak or when they crash into each other the camera is often focused their butts as they are lying on the floor.