The 6teen writers certainly loved having Jen get caught either shirtless or nude, though this was censored accordingly.
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 a hostess, maid, Femme Fatale, etc.
Aqua Teen Hunger Force: One episode has Shake and Carl trying to score with a sexy construction worker named Dusty Gazongas. It's strongly implied that being sexy is mostly all she does.
Archer: Just about any female who is a main character.
The one who clearly has been this the most is Lana Kane, who usually wears mini sweater dresses that show off her legs, not to mention she has spent a good number of episodes either in the underwear or completely naked.
Cheryl is this as well, but her most notable time was during Archer Vice when she was the country singer Cherlene. Most episodes saw her in short shorts and in the episode "On the Carpet" she spent the whole episode topless.
Pam has probably more than Cheryl, but less than Lana. She has also spent a lot of time naked.
And last, but not least Malory. Her's is the lowest, but she's still been in the buff in quite a few episodes.
Might as well count Krieger's virtual girlfriend who is a walking anime stereotype. Right down to her almost always visible panties.
While Widow was shown to be this in the 1st season, she was most definitely fan service in the second season. In the second season, she has longer, beautiful hair, curved beautiful eyes, and an improved body. She wears a very form fitting blue jumpsuit (which receives highly detailed animation), her arms are more muscular, her breasts are more buxom (however, she was shown to be well-endowed in the first season but she is very buxom in the second season), her shoulders are more broad and ripped, her body is shown to be very muscular (yet voluptuous), and her legs are also shown to be more longer and muscular.
In "Beneath the Surface", Widow (along with Hawkeye) wore a very form-fitting aquatic version of her costume that allows for her to breathe underwater and just like her 2nd season costume, the suit still accentuates the muscular yet voluptuous build that she has for her incredible body.
Poison Ivy. Wears a very form-fitting bathing suit with tights that accentuates her voluptuous body, buxom breasts, and long shapely legs. 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.
Queen Tyr'ahnee from Duck Dodgers. Ebony skin, silken white hair, a brass bikini top, see-through skirt, and frequent episodes of nightgowns and other fetishistic costumes.
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".
Princess Mandie from The Fairly OddParents!, a hot alien babe with yello skin and long purple hair. Leaving aside the Yugopotamians all the male characters find her very attractive (especially Cosmo).
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's a very beautiful raven-haired Amazonian woman who gets the majority of Male Gaze in the series due to the fact that she usually wears a strapless leotard that highlights her very large breasts, long toned yet shapely legs, voluptuous yet toned body, hourglass figure, toned broad shoulders, and nicely toned rear. 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 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 prevents Panty Shots, even when she falls over. She attracts a few men in the show ( included Flash).
Kaeloo: The titular character. She tries very, very hard to make her "booty" be noticed.
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.
Chicago from Producing Parker is easily this. Other episodes has Parker and Dee in their undies a few times.
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.
On a few occasions Meg plays this part (though in other episodes she's said to be very ugly), most notably in "Halloween on Spooner Street" and "This Little Piggy".
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 uses for the hair exposing her entire body naked.
American Dad! has both mother and daughter, Francine and Hayley Smith.
Francine is a very attractive woman and there are many fanservice tropes relate to her. 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.
Hayley is not at level of her mother, but again present. One of early episodes has she work as stripper and another models nude, making a big deal on how it's totally not scandalous..until she sees that Roger is in the class. Another episode had her twerking in a skimpy outfit during her time as a blonde.
The Cleveland Show has Roberta Tubbs. Portrayed as a sexy teenager, she often wears skimpy clothes. Two good example are the episodes "Fat And Wet" & "To Live And Die In VA" which have Roberta in a bikini in the former and dressed as Slave Leia in the latter.
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 acts 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 strips 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 specials have Fanservice scenes with her also. In Real Life she appeared in Playboy posing semi-nude!
Felicia Hardy is a slightly petite but nonetheless a very attractive blonde who has a slender body and wears short skirts with her shirts or beautiful dresses. Thanks to a Super Soldier serum similar to the one used in the creation of Captain America, Felicia gains the ability to morph into a taller, very beautiful woman called the Black Cat (complete with white hair along with a huskier and more sultry voice and a personality change into that of a self-confidentFemme Fatale in addition to increased human reflexes and strength) and wears a very form-fitting black Spy Catsuit that highlights her newly developed very large breasts, long muscular legs, strong toned muscles, toned midriff, strong and tight toned abs, ripped broad shoulders, nicely toned buttocks, and muscular yet voluptuous body.
As always, Mary Jane Watson qualifies through being a fairly tall, very beautiful red-haired woman who tends to wear outfits (which include either a yellow sweater with a pair of blue skin tight jeans and red boots, a form-fitting Spy Cat Suit, or a black dress) that accentuate her buxom breasts, long toned yet shapely legs, toned broad shoulders, and voluptuous yet toned built that she has for her attractive body.
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.
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.
Livewire and Volcana for the villains.
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 fans remember her despite only appearing 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.
Stella in Winx Club. Downplayed due to the all-ages nature of the franchise, but present in the early season where she wears many skimpy outfit and is very flirty. Her first "everyday" outfit in Seasons 1-2? A skirt that just barely long enough to cover her crotch, and her shirt look like a bikini top with a collar, albeit one that had torn and needed to be tied together to keep her breasts from showing (since there was really no way she was hiding a bra underneath it). Plus, in a Beach Episode of Season 2 she wear a lifeguard red costume for no reason other fanservice.