Nina Dowd/The Mighty Endowed (DC Comics) can hypnotize people with her breasts.
Etra (The Dictator) is well trained in using her breasts as weapons.
Natalie's (Epic Battle Fantasy) weapons are her Magic and Huge Breasts.
Kawai Hanabi (Keijo!!!!!!!!) is a very skilled in using her bust for fighting.
Rias Gremory (Highschool DxD) gained the ability to project a red light from her breasts, which recharges Issei's energy. Each use of this power causes her breasts to temporarily shrink in size, which makes Issei cry even though it's sometimes necessary. Her breast size will restore itself after a few days of rest.
Kusakai Mio (Keijo!!!!!!!!) can hypnotize people using her Breast Hypnosis Technique against anyone.
Hououin Sanae (Keijo!!!!!!!!) using Perky Pile Piper a technique that can send her opponents flying a considerable distance away.
Sakashiro Maya (Keijo!!!!!!!!) dueling Kaminashi Nozomi with Heaven and Hell breast strike.
Black Cat (Marvel Comics) uses her breasts as ballast.
Sara (MisFits) can use her hypnotic breasts against any men.
Maiden who carried the ambrosia of the gods like Dorothenea (Nectar of Dharani) can use the “nectar” in her breasts to empower whoever indulge in them, with the price of turning into a berserker to fight in her behalf.
Melona (Queen's Blade) can use this power, as her acid infused breasts melt all they touch.
Ageha Kurono (Rosario+Vampire) using her Oppai Missile special attack.
Maria (Seikon No Qwaser) are known for their "soma", a mystical substance found in their breast milk that empowers all Qwaser to manipulate periodic elements for battle.
Mafuyu Oribe (left) and Tomo Yamanobe (right) (Seikon No Qwaser) are both powerful Maria that assisted their Qwaser in their battles...
...Tomo however has proven to be a far more powerful Maria, due to having more potent Soma them most and bigger breasts that she can use to her advantage for herself.
Miyuri Tsujidô (Seikon No Qwaser) releases powerful energy blast from her breasts, obliterating anything in her path.
Sariel (Seven Mortal Sins) can use her breasts to strike with powerful force.
Mammon (Seven Mortal Sins) breastmilk has hypnotic and illusionary properties that she uses to her advantage on anyone.
Ivy Valentine (Soulcalibur series) can use her large breasts to her advantage.
Raven Hex (Tarot: Witch of the Black Rose) can channel her magic through her breasts to create powerful blast.
Tarot (Tarot: Witch of the Black Rose) has the same sex magic as her sister Raven Hex, thus having the same potential to use her breasts as she does.