The Legend of Kage is a video game for the arcade and NES about a ninja (the titular Kage) who must rescue Princess Kiri from a shinobi clan. It has a sequel on the Nintendo DS, which has much more in terms of a story.
Blue Oni Red Oni: Not in terms of personality, really, but Yukinosuke and Kage provide the visual equivalent with ice powers and blue color theme for the former, fire powers and red color theme for the latter, and otherwise identical designs.
Boobs of Steel: Ayame is the oldest of her sisters, the strongest fighter, and thus the bustiest as well.
Impossibly-Low Neckline: Justified - you can actually see straps that tie Ayame's kimono's neckline to a choker on her neck to keep it from falling all the way.
Let's Get Dangerous: Realizing their master Yoshiro is depending on them to hold the player off as much as possible, the Three Sisters become a lot more serious in their triple team battle.
Lighter and Softer: Chihiro's story is noticeably more light-hearted than Kage's. For example: the Three Sisters survive; Princess Kiri is able to bluff Hanzo into not killing her, in contrast to Kage being forced to strike him down in his story and go on the run with her; and there are just generally more comedic moments between Chihiro and the Three Sisters.
Luke, I Am Your Father: Chihiro is actually Princess Kiri's younger sister, who was left with the Iga Ninjas to raise, but only the latter remembers this at first.
Broken Pedestal: Arguably, he was only doing his job, but his portrait made him look a bit too enthusiastic to kill Princess Kiri, plus his crazy laugh and rant after he finds out that she is "dead" in Chihiro's story implies that he is possibly in league with the demons. Of course, he could have just been putting on an act...
The Unfought: Despite his cool design and antagonistic nature revealed later on, you never fight Hanzo.
Miko: Kaede dresses in a hakama similar to that of a miko, barring the short shorts.