Bleach: Rangiku Matsumoto is very fond of showing off her huge Absolute Cleavage no matter what she's wearing. However, she's mostly just a harmless, gentle-hearted tease, who is neither nasty about it nor prone to picking on the appearances of other females. Despite this, the anime changes her personality in filler to have her constantly tease Nanao about her chest size, making Nanao (again, anime-only) very self-conscious.
Kanako Oomori from Cage of Eden views her large breasts as her only redeemable feature since she feels she's too clumsy to be of use to anyone.
Fuji-Sensei from Chitose Get You!! tells Chitose that she can't be treated as an adult because she doesn't have large breasts all the while bouncing her own breasts to brag.
Eiken's Kirika Misono just loves using them to embarrass (and "attempt to seduce") Butt Monkey protagonist Densuke... both clothed and in nude.
Siesta from The Familiar of Zero becomes very boastful about her large breasts due to her love interest Saito preference for large breasts and her rival Louise being flat chested. She frequently brags about her large breasts to Louise and her favorite seduction technique is to let, and in some cases force Saito to touch her breasts.
Carul Mendosa (or Carmen99) in GUN×SWORD is very proud of her chest. The 99 in her name refers to her measurements.
In Neon Genesis Evangelion the first image the audience and Shinji see of Misato is a photo she sent to Shinji of her bent over showing off her cleavage and an arrow pointing to her cleavage with the caption "Pay attention!!"
In Hayate the Combat Butler, when Hayate mentions that he's noticed Athena's growth after their meeting and battling after ten years, Athena questions what part he noticed, and makes sure that he answers correctly.
Miki from Hell Teacher Nube loves her large chest, tries to flaunt them whenever she can, and brags about them to her flat-chested rival Kyouko.
In an episode of Inukami! Yoko is distressed over Keita's infatuation with the seemingly perfect Nadeshiko who moves in with them. Her worries momentarily vanish and she becomes boastful when it seems that Nadeshiko doesn't have large breasts like her but after forcing her to show her breasts she finds out not only does Nadeshiko have large breasts but they're also larger than hers.
Kanokon's Chizuru frequently uses her large chest to seduce her love interest Kôta. In an episode she gets really down when a curse temporary removes her assets.
A lot of female characters from Manyu Hikencho, unsurprisingly since it takes place in an alternate feudal Japan (specifically set in an alternate Edo era), breasts mean everything. A lot of women, more specifically noblewomen like to flaunt there breasts or walk around with an air of superiority
At least during the early part of the Rosario + Vampire manga, Kurumu was very proud of her... talents... and regularly taunted a smaller girl about it.
Bloodberry from Saber Marionette J who's the bustiest of the main character's, Otaru, trio of robot girls, likes to use her assets to flirt with him constantly and teases Cherry for her lack of endowment.
Charlotte E. Yeager or Shirley from Strike Witches seem to have no qualms about showing off her breasts and allowing her comrades to grope and fondle them. She even declares her rack is better when another big breasted Witch shows up.
Double Subverted in a episode of UFO Princess Valkyrie where Hydra jokingly tells Valkyrie to make Akina's breast bigger, and Valkyrie does. At first Akina's looks like she's going to hurt Valkyrie but thanks her instead. Her breast go back to their small size and she gets angry when Hydra jokes about it.
As most comic superheroines tend to have huge chests, it takes a lot of effort to have one stand out, but Emma Frost manages to define this trope, being one of the few comic characters to openly admit to having had breast augmentation. And let's not go into her preferred fashion style...
Latex Red, a villain from the comic 3 Little Kittens, also was quite openly boastful about her breast implants...which, instead of silicone, were nuclear warheads. According to her (very buxom) former team mates, she got them after she was thrown off the team because she thought she needed to "outdo" them.
The title character of The Savannah Reid Mysteries is Fat and Proud, and on the few occasions she is insecure about her weight, she claims that being large has also given her a big chest, which makes her more attractive to some than being skinny would.
In one episode of Seinfeld, Jerry dumps his girlfriend, Sidra, after Elaine convinces him that Sidra's breasts are the result of implants. A miffed Sidra (played by Teri Hatcher) exits with this line:
Sidra: And by the way, they're real—and they're spectacular.
Max in 2 Broke Girls. Her day to day work outfit and casual clothes don't tend to accentuate her large breasts, but when given the chance (such as in the extremely Fanservice-friendly dress in the Season 1 finale), watch out. She also is fond of joking about them, and is often amused (as opposed to offended or disturbed) when others notice the obvious.
In an early episode of Hells Kitchen, a rather buxom patron was growing annoyed at the delay that was taking place with her order and went up to the pass station to try to get Gordon Ramsey to put a rush on it. When he basically said something like, "Put your boobs away and go back to your table," she got annoyed that she wasn't getting special attention and slammed some food dishes to the floor. Ramsey had her thrown out.
While not much attention was drawn to Jacqueline Moore's boobs, and most that was were punchlines on their size, she bore no shame for them and would proudly state how much woman she was when put in a bikini contest by the WWF.
One of Jacqueline's partners in crime, ODB, is similarly endowed and much quicker to let everyone looking at her know it. This reached its apex in TNA, where she took the company's acronym literally and got a shirt with hand prints on its chest, which she would frequently squeeze.
Traci Brooks was proud of her large breasts, not that she will just let you look at them for free, you perverts. If you're really that interested you can buy a TNA pay per view or tune into Spike TV!
In an episode of Braceface, Sharon gets a pump bra to give her more prominent breasts and enjoys all the attention she gets and that more people are treat her like an adult. Her best friend tells her that it has nothing to due with the bra it's just that she's acting more confident but Sharon is insistent that it's because of the bra. Unfortunately, the bra would end up being a source of embarrassment when it malfunctions during a party, expands way too much, and makes her a laughingstock.
Booberella, from The Simpsons is an Elvira parody who constantly tries to make sure her tv audience is staring at her breasts.
Yes, there are women out there who love their well-developed breasts. Even if some admit to having a problem or two with them, they still love them no matter what and consider them to be worth it.