Nagomi Yui

Yui is one of the Cures in Delicious Party Pretty Cure. She's a talented athlete, and her family owns Nagomi Diner, a restaurant in Oishīna Town.

Personality
Yui isn't exactly the type to look before she leaps, springing to action to help people in need. She also really loves food.

Nagomi Akiho
Yui has a good relationship with her mother. She loves her mother's cooking, believing it to be the best in town, and doesn't mind making dinner when her mom has to work late.

Nagomi Yone
Yui seems to have been very close with her grandmother, as she was the one who taught Yui her favorite phrase, "food brings smiles". Yui frequently quotes her grandmother or thinks about her childhood memories with her.

Shinada Takumi
Yui and Takumi have been friends since childhood, though recently Yui seems to have drifted away from him a bit, forgetting to meet up with him or unintentionally outright ignoring him a few times. It's implied that he may have a crush on her.

Kome-Kome
Kome-Kome looks up to Yui, and the two are close. Kome-Kome stays at Yui's house as a "pet" she's looking after.

Rosemary
Rosemary and Yui are friends. Initially, he was worried about letting Yui be a Cure, feeling like he was inadequate, and getting her involved in something dangerous because of it. He ended up changing his mind, though, and they work more as a team now. She calls him "Mari".

Abilities
Her main attack is 500 Kilocalorie Punch. She later gets a stronger version, 1000 Kilocalorie Punch.

With the Heart Cure Watch, she can perform her first solo finishing attack, Precious Triangle.

With the Heart Juicy Mixer, she can perform her second, stronger solo finishing attack, Delicious Precious Heat.

She can also use the Heart Juicy Mixer to perform Mix Heart Attack, a group finisher with Cure Spicy and Cure Yum-Yum.

Etymology
Her surname, Nagomi (和実), likely comes from the Japanese words 和む (nagomu), meaning to be softened or to calm down, and 実 (mi), meaning nut, fruit, seed, or pieces of meat, vegetables, etc. in a broth. It is also likely based on the Japanese word 五味 (gomi), which means five flavors.

Cure Precious was likely chosen because the end is the same as that of delicious.

Trivia

 * Her birthday, August 31st, is Vegetable Day in Japan.