夏木 あい Natsuki Ai
|Season||Yes! Pretty Cure 5|
Yes! Pretty Cure 5 GoGo!
|Age||about 5 or 6 years|
|Relatives||Natsuki Kazuyo (mother)|
Natsuki Rin (sister)
Natsuki Yu (twin brother)
|Japanese Voice Actor||Yukino Satsuki|
Natsuki Ai (夏木 あい Natsuki Ai?) and her brother Yu are twins and Rin's younger siblings. Ai and Yu are so naughty that they always trouble Rin. But they're mostly like normal little kids who want to have fun and are curious about things. Despite being a real pain to Rin, the siblings share a strong bond and the twins' big sister will do all in her power to protect them. Ai and Yu get very well along with Nozomi despite annoying her too, which probably is because of her childishness and sister-like relationship with Rin.
Ai looks like a six years old girl, wearing a white T-shirt, vermilion shorts and pink trainers. Her short chestnut-colored hair has a tiny tuft at the front, and her eyes are that color too. Ai bears some resemblance to Rin and their mother, and is identical to her twin.
Ai is first seen when her big sister Rin comes home, and runs with Yu. They annoy Rin and make her angry. Rin gives them the ball, and they both decide to play with Urara and Nozomi. While playing, they spot, Coco and Natts. Urara becomes scared and kicks the ball and takes the attention off the mascots. While playing for more, Yu kicks the ball, which then happened to be in Gamao's hands. Gamao spotting Nozomi and Urara makes a Kowaina and then the girls arrive and transform into Cures. After Gamao's defeat, Ai and Yu hang out with Rin.YPC513
- She shares her first name with a baby fairy also called Ai, from the season Doki Doki! Pretty Cure.
- Her voice actress, Yukino Satsuki, also voiced the following roles in later seasons of Pretty Cure, namely: Hojo Maria from Suite Pretty Cure♪, Hino Masako from Smile Pretty Cure! and Yura from Go! Princess Pretty Cure.