Obscure Philips CD-i game The Apprentice is mostly known online these days for a number of secret passwords that let the player see the protagonist use his magic to strip some girls; as a parody of Mortal Kombat, these scenes are referred to as "Nudalities".
ARMS is mostly known due to the popularity of its female characters, especially the voluptuous Twintelle.
Bayonetta is an extremely fluid, highly-refined Beat 'em Up with some of the deepest combat mechanics ever put in a Stylish Action game, and a distinctly over-the-top, gloriously Camp style that, between it and its sequel, has earned an array of accolades, awards, and even a few coveted perfect scores. But the eponymous Bayonetta's Spy Catsuit is usually the first thing that comes to mind. Or the fact that her boss-slaying cutscenes leave her temporarily wearing nothing but Godiva Hair. That and her extremely sensual and teasing personality just pushed the 'fanservice' factor even bigger.
Since BioWare has, for the longest time, been the only major Western RPG producer who consistently included Romance Sidequests in their games, you'd be forgiven for thinking that that was all their games were about if you never played them. Curiously, you'd get that impression regardless of whether you listened to the detractors or to the die-hard fans.
Kanna from Blaster Master Zero 2 is disproportionately more popular than anyone else in the game, or even the game itself. The second's worth of screentime she made in the reveal trailer from the Nintendo Direct was enough for anyone who's into plant girls with Gag Boobs to spontaneously generate fanart of questionable intent, regardless of whatever she's like or wherever she's from.
BloodRayne was a series of action-adventure games made primarily in the early 00s, most famous for the Stripperific main character who at one point posed for Playboy.
Bombergirl has gained a cult following outside of Japan namely through it cast of cute and/or sexy girls shifting from the cartoony robot characters from the classic Bomberman games more than the game itself (which isn't helped by the fact it was never released outside of Japan), and one of its defining features involving seeing the girls clothes being blown up when the player or team is defeated. The game has spawned a number of fanart of the titular Bombergirls, some of which come in the spicy variety, especially when it comes to SepiaBelmont, Olive, Pine, and GrimAloe.
Conan Exiles was a Survival Sandbox set in the Conan the Barbarian mythos that pitted the player against all kinds of hazards and had them fight for their survival and create their own legend. All of this didn't matter, as what really made news headlines was the fact characters all started naked in Early Access and the option to adjust the size of male genitalia.
Dante's Inferno is either about a more action-y take on one of the best known depictions of hell, and quite possibly being the first mass marketed media about the subject for a while, or it's about Lucifer's enormous schlong.
Even though the Dead or Alive series is one of the most refined 3D fighting game franchises in the market on its own merits, the vast majority of the public only remember the female fighters' curvy model-esque bodies and Jiggle Physics, for better or for worse. Of course, Tecmo isn't trying to mask it or anything. They ran straight to the endzone with that knowledge (and zero regret) when promoting Dead or Alive 3. Even 5, which tried to tone down (and failed miserably) the "doll-like" features of their female fighters and make them more natural looking, offered all sorts of sexy incentives for preorders like fuzzy bunny bikini costumes and squishy mouse pads, and even going back to the roots later on in the game's lifecycle. Also the Xtreme series, as a volleyball/jet ski game, is basically the video game development equivalent of an Excuse Plot. Watch and observe. Did you notice much sports action in that trailer?
Dragon Quest III can be summed up in four words: Female Warrior, Chainmail Bikini. Most of the other female classes are also excessively popular, particularly the Sage, Cleric, and Jester. DQIII did (and still does) have a lot going for it such as the then-big reveal that the game's a prequel to its two preceding entries (you're the eponymous Erdrick/Loto whom the trilogy is named after), and Ramia, the bird your party flies around the map on, even shows up in the eighth game as the Godbird Empyrea, but if there's one thing emblazoned in the fandom's minds, it's the women... and the game encourages this!
Dragon Quest IV was the first game to have multiple party members with distinctive personalities, rather than use a predetermined party or a team of Player Mooks. Of all the characters, StripperifficMs. Fanservice Maya's artwork is leaps and bounds more voluminous than any other character in the series.
The Stripperiffic Jessica of Dragon Quest VIII, appearing as the only one who can change outfits on maps and puff-puff the enemies into various states of confusion with her sex appeal abilities.
Vanillaware's title Dragon's Crown became an example of this pretty much immediately after its characters were revealed. Fans are less concerned about the contents of the title (which, granted, is little to worry about since Vanillaware's releases are consistently decent) and more concerned about how much Fanservice the Sorceress and Amazon provide.
The other thing that sets Etrian Odyssey apart from other dungeon crawlers besides its difficulty and mapping mechanics are the cute female character portraits, which cater to many kinds of fanservice.
To some fans, Fire Emblem Awakening might as well be called "Super Ultra Waifu Fanservice Simulator 3000" due to its Dating Sim elements and Beach Episode DLC, never mind that it's supposed to be a medieval fantasy Turn-Based Strategy RPG. This is also most likely the reason that Tharja and the grown-upHotter and Sexier Tiki are the most well-known characters from the game. The next game in the series, Fire Emblem Fates is not faring much better in this regard. From the get-go, a lot of focus was placed on the character Camilla and her... assets. The eventual announcement of more fanservice-y elements in the game, such as the infamous face-rubbing game, hot springs, and the ability to dress your characters in swimsuits have split fans.
In fact, the last example got such a massive jump in popularity after her Fanservice Pack upgrade in Xrd Rev 2 that "Baiken Main" became a derogatory term for people who choose their main based on who they like for their fanservice and are bad at playing them (especially for Baiken) or the game in general - if they even care about the gameplay.
Even its sister series BlazBlue has this, especially within the characters. This is because the game's actually deep and entrenched plot makes casual fans find it hard to enjoy the story, so players turn to the characters and mostly a lot of female characters that bared their backs a lot, or having really big and jiggly boobs. Ask people about Bullet, Makoto, Litchi, Nine the Phantom, Mai, and Es and- probably the first that comes to mind are their boobs (or in Bullet's case, her really really short pants). Which is rather egregious, since when you look past their assets, they are actually solid characters on their own with rounded personality and a strong story arc... yet it's those 'assets' that are highlighted a lot.
The Last of Us Part II will be remembered for being Naughty Dog's first game with explicit sexual content. Especially the sex scene between Abby and Owen which has reached Memetic Mutation in record time.
People with only passing knowledge of League of Legends, from people with zero interest in the MOBA genre to people who actively hate them, may still recognize some of its attractive female champions from its Loads and Loads of Characters.
This can happen sometimes even with alternate costumes or skins. Ask a League of Legends player who isn't super hardcore into it and only knows about a bit about each champion to tell you about Riven, the Exile, and rather than talking about the warrior woman in ragged armour wielding a gigantic but broken sword, they're more likely to say "Oh, you mean the Playboy Bunny?"note Battle Bunny Riven resulted from one of the biggest forum threads in LoL history and the skin is so popular you are seriously more likely to see it being used than her base skin.
The game it's remade from, Namu Amida Butsu!, judging from what traces of it that are preserved online, was apparently even worse it featured imagery and voices that skimmed the boundary of straight-up eroge territory. Gems include an enemy's causing unstoppable lust in the first chapter, several cards featuring suggestive imagery, one of which is bondage, complete with suggestive dialogues.
Otomedius is best known for being a 'sexy flying girls' clone of Gradius. Oh, there's a little something about guest stars from Life Force/Salamander, Castlevania, and Busou Shinki, but when all the promo posters for the game shove the protagonist and her twin 'fuel tanks' in the audience's face, there's only a couple of things that will stand out for them.
Tracer is known for one of two things: her butt and controversy to it at pre-release; or being the head honcho of the titular Overwatch and a well-rounded character. Either way, nobody is complaining one bit about it...
Inverted with various pornographic Qix knockoffs, where they're remembered more for their blatant copyright infringement and the women turning into abominations such as Pinhead than the actual erotic content.
Rust: It's a rare male example, since it's Male Frontal Nudity, but you start balls-out naked, and that's about what half the Internet knows about the game. There's a mosaic by default, but it can be disabled. Pants are a highly treasured bit of loot.
Senran Kagura is best known for its large cast of particularlybouncy schoolgirls and utterly shameless fanservice with a penchant for leaving said girls in lingerie. Those who've actually played the game report competently-executed and enjoyable brawlers, with an actual plot that is not only well fleshed-out, but almost devoid of fanservice, portraying the Shinobi as people with their own goals, values and sacrifices.
Shantae is a series of Metroidvania games with fun gameplay, a sense of humour that ranges from the oddball to the sardonic to the just-plain meta, and a rocking soundtrack. All that tends to be what makes fans stay though. How most people discover the series is by way of seeing others talking about or sharing fanart of the franchise's titular Belly Dancer protagonist and its supporting cast of equally adorable and sexy women clad in lovely Stripperiffic attire.
Skullgirls has a rather cool art style, a good story for a fighter, some interesting characters with personalities that shows they actually have more depth to them then just their looks, some even having a tragic past but still been an up beat inspiration and good role model, and is an overall fun and solid tournament fighter. But most people who haven't played the game for more then 10 minutes or at all often get stuck on its admittedly not so hidden fan service. Keep in mind said fan service is played for laughs and is only focused on for a few moments to deliver a punchline or two once in a while and then the game moves on and usually stays focused on the story for the most part — and later veers most of the fanservice into Fan Disservice.
This is the reason why Shadowverse was nicknamed Waifuverse at one point, by newcomers of the Card Game who immediately noticed the anime-inspired Fanservice of the characters and cards.
Why should you play Snatcher? You get to flirt with all the women! And there's nudity! And something about Communist robots taking over the world with Replicant Snatching, probably. Might as well play Policenauts for the same reason. You can flirt with every girl in the game; you can even grope them!
Any and all discussion of TERA will be dominated by and centered around the rights of the female playable characters to wear Chainmail Bikinis, and whether or not people who play as Elins are pedophiles because they wear the same stuff that all the other females are wearing.
Time Gal: The most remembered thing about the game is the fact that it has a girl running around in a bikini for the whole game.
Tomb Raider: Lara Croft has huge guns - oh, and pistols, too. A lot of people play the game through on all difficulty levels and get all the trophies-just to unlock the bikini costumes, and to angle the camera to get the best view of Lara's ass and boobs. Subverted with the 2013 reboot and sequel due to her assets being toned down in the game's overall more realistic art style.
Touhou is about a world of super-powered magical action girls (many of which are Cute Monster Girls who are Really 700 Years Old) who have interesting (but never romantic) relationships with each other, which can gives way to tons of fanart (cute, gorgeous or very risque) and awesome music. "Shoot em ups"? What's a "shoot 'em up"? note Unlike other examples on this page, the creator does lament that it's not best known as a shoot 'em up.
Trauma Center: "Moving Heart" is one of Trauma Team's most infamous levels; it's a Diagnostics level, and you sometimes need to get your patients to lift up their shirts in order to listen with your stethoscope. In that particular level, your patient is an attractive woman with great cleavage that's even acknowledged in-universe.
Xenoblade Chronicles 2 is an RPG with an incredibly complex combat system, massive open world, hundreds of sidequests that flesh out the details of the setting, and main plotline centered around an effort to save a dying world from a terrorist organization that's trying to recover an ancient superweapon. Ask someone with only passing knowledge of the game about it, and they'll probably reference the main female lead's Stripperiffic default costume or the fact that some of the optional blades have sexualized designs.
Ask someone what they know about Xenosaga. Most people will probably answer "It's the game where KOS-MOS is from" and next to nothing beyond that.