In Warriors Orochi 3, Zhenji and Cao Pi go to He Fei to rescue Lu Xun from a serious predicament. After they drive off his foes, a Wu soldier charges at them, mistaking them for enemies. Zhenji just goes "lol no" and slaps the Mook's sword away with her bare hand. In addition, the sword...well, I don't have a good measurement, but I can tell you that it landed a great distance away from her, Cao Pi, and the unsurprisingly baffled soldier.
Hayabusa's debut in Anegawa. Kiyomori is just reciting the spell to mind control people, and suddenly there comes Hayabusa, just standing up with Badass Arm-Fold behind him. Kiyomori intercepts, Hayabusa uses wall run to dodge Kiyomori, ending with a clean leaping slice. "Mission Accomplished". All to the tune of his Leitmotif, the remix of the Stage 4-2 NES Ninja Gaiden theme.
Sun Ce: You could never break us, what made you think otherwise?
Sun Quan: In fact we should thank you for strengthing our bonds!
Sun Shang Xiang: That's right! You shall be punished for the trouble you have caused.
Sun Jian: You are no match...for the combined might of the Sun family!
Each one then strikes Orochi with their weapon at the same time and causes him to explode.
During the Intro Movie for the First Game, it shows Orochi bringing all the warriors and creating the realm. It shows places such as Nagashino, Chibi, and Edo being sucked in. Others are looking on in confusion and shock at what just happened and what's going on when Orochi appears with his vast army. Who's the only one who's keeping a cool head and staying in control this entire time despite all that happened? Nobunaga himself.
In Battle of Nagashino for 1, Takeda-Uesugi-Huang Zhong Coalition are in their Darkest Hour. But then Shingen-Kenshin prepare a plan to unleash the cavalry. Then, eventually the literal cavalry really comes with Kanetsugu Naoe in command, and the gloomy music of Nagashino is changed into this awesome music.
Anytime Tadakatsu Honda appears in 1 in The Gaiden Stages. Appearing when things start to look gleam and single handily raising morale himself and frightening the Enemy forces. There's a reason why Tokugawa would've won against Orochi if he had had Tadakatsu with him.