Kasumi Momochi

Kasumi Momochi is the pink ranger of the Ninningers, also known as MomoNinger, and she is also the first girlfriend of Kuroninja to also be a part of his core 7.

History
Kuroninja and Kasumi first met when Kuroninja was teaming up with the Flowery Kunoichi Team. It is unknown how, but Kuroninja was able to convince Kasumi to go on a date with her. What he didn't realize was that Yakumo also had a crush on Kasumi (despite the fact that he and Kasumi are cousins).

Momoninger is Missing
Later, due to some events involving the Earth 0 counterparts of Kasumi and Houou Soldier, Kasumi went missing for a while and Kuroninja couldn't find her. He eventually found out that she had been kidnapped by Natsuki, as revenge for being left in The Void for a long time. Kuroninja found Kasumi and the two of them fought against Swordblade X.

Kuroninja also introduced Kasumi to the Multiverse, which is probably one of the reasons why Kasumi is into Kuroninja.

Power of the Dragons
Kuroninja went on a date with Kasumi and that's also when Yakumo realized that Kuroninja and Kasumi were dating. No one knows what will happen but knowing Kuroninja it's probably going to involve a love triangle. Or maybe Kuroninja won't care since he's also dating 6 other Sentai rangers.

Trivia

 * Technically, Kasumi should be Kuroninja's second girlfriend, but since Kuroninja has nothing to do with Shironinger, Kasumi is Kuroninja's first girlfriend.