Before all the other examples, a certain SaphineGrace MUST be mentioned. Every damned line she had ever uttered was sexual in nature, her voiceovers in battle having her moaning in the throes of orgasm, and she engages in Foe Yay with damn near every good guy! Even her mech is Fetish Fuel, seeing as it has a naked woman as part of the motif. If that isn't enough, she even goes topless in Shu Shirakawa and Masaki Andoh's presence at one point to presumably embarrass the shit out of Masaki and turn on Shu (doesn't work for him, though). Also, her outfit, while nowhere near Lamia Loveless/Xine Espio/Kaguya Nanbu levels, still manages to highlight her feminine charms quite well in official art.
Wait...a Yandere in Super Robot Wars? Tsundere may be aplenty, but this troper can't recall if there is a yandere amongst the OG Numbers
Try Aria Advance from Super Robot Wars W; she hates Kazuma Ardygun (the game's protagonist) and wants to steal his sisters from him. It helps that she's Kazuma's Opposite Sex Clone, hence the jealously to become the new head of the family, following their father's departure.
Speaking of Elegant Gothic Lolitas, now that this troper thinks about it, Badass Lolita Latooni Subota has found herself subject to a lot of Fetish Fuel. During the scene where she first gets her trademark dress, she's mentioned as having had worn a "baby doll" style dress before that. Note that official lineart◊ of said first dress exists. Also note the stuffed animal and the handcuffs. Also, in Divine Wars, when the relationship between herself and Mad Scientist Adler Koch is revealed, the viewers are treated to a short scene of Latooni's prior conditioning: strapped to a metal chair in a skin-tight suit with a brainwashing headset over her head, huge cables leading from the suit and helmet, all but wrapped around her body, and Latooni of course, is breathing so hard her chest is heaving. Does This Remind You Of Anything?
Lets not forget the fact that, if this troper is thinking of the same thing, the "real men riding each other" bit involves one mech wielding a giant sword and the other turning into a horse...Yes, I went there.
Tentacles...Einst...Stern Regisseur's the size of a planet (or a moon; close enough): do the math. And yes, doujinshi material uses this concept to appease the tentacle fans
Also, this troper, having not played Namco x Capcom, was rather shocked to discover that Reiji's preferred method of disciplining Xiaomu is spanking. Particularly one scene where he does it to her in the middle of an extended conversation while nobody was looking. As a matter of fact, there's a rather surprising amount of spanking in this game PERIOD
Another from Divine Wars: of all things, Ryusei's outfit in the first two episodes. He's wearing a sleeveless hoodie, and clearly isn't wearing anything with sleeves underneath that. This particular troper has a thing for guys with bare arms. A + B = C = mrowr.
How the HELL did this page got here without a single mentioning of Excellen Browning? A well endowed female with flirty personality that likes to tease everyone around non-sop and is known for walking around ship/military base in a Playboy Bunnysuit "to rise morale of the troops". Have I mentioned that she apparently swings that way too? And let's not get started on OG 2, where she gets Brainwashed And Crazy, gets a Loliclone and both her and Alfimis mechs are basically made of tentacles with some armor strapped on top. Details of said brainwashing are left to interpretations.
And then there's the I Call It Weissy vibe she has with the Weissritten; this troper somehow finds himself envying that mech, and not just because it has a huge rifle.
Excellen will pretty much flirt with anything that has a pulse, but the Original Generation games otherwise keep her faithful to her partner, Kyosuke Nanbu. But even THEN, she's pretty up-front about how she'd make an exception for the Tall Dark And BishoujoVilleta.
Xiaomu! Foxgirl◊ in a sexy, tight Chinese dress that has a slit up to her waist. She has a giant zipper attached to it implying she could show less skin but chooses not to. She wears a vest over the dress and on top of that she fights in sexy high heeled sandals. She also has a flirty and playful personality upfront (she is based on Excellen) but has her Mama Bear tendencies towards Reiji and an adorable caring side as well. Additionally, one of her specials implies she can use magic to change into any outfit she wants (which she has done with: a maid outfit, gym bloomers, a Hadaka Apron and a wedding dress).
If we're put the Namco x Capcom originals with SRW due to Endless Frontier, then we can count Saya too. Oh my god Saya◊. Busty and is courteous enough to tell you her measurements, cool and sultry and will shamelessly flirt at any time. Her outfit involves a tight jacket held together by three belt straps, Bare Your Midriff, high socks and hot pants.
Actually it's four belt straps. Top one is just not fastened together.