- Birth Name: Nonaka Miki (野中美希)
- Nicknames: Nonaka-chan (のなかちゃん), Chel (チェル), Mikitty (ミキティ)
- Date of Birth: October 7, 1999
- Place of Birth: Shizuoka, Japan
- Blood Type: A
- Height: 157cm
- Hobbies: Collecting cute things
- Specialty: English, copying by ear, piano
- Favorite Food: Katsudon, CheLsea candy
- Least Favorite Food: Most Chinese food, vegetables
- Favorite Color: White
- Favorite Subject: English
- Looks Up To: Sayashi Riho, Ishida Ayumi, Nakajima Saki
- Hello! Project groups:
- Morning Musume (2014–)
Nonaka Miki was selected from Morning Musume's 12th Generation "Golden Audition" to join the group on September 30, 2014, along with Ogata Haruna and former Hello! Pro Kenshuusei members Makino Maria and Haga Akane.
On February 5, 2018 it was revealed that Nonaka would become one of several official ambassadors to the NBA for Rakuten TV.
- [2015.06.xx] Greeting ~Nonaka Miki~ (Greeting~野中 美希~)
- [2016.09.24] Nonaka Miki Mini Photobook "Greeting -Photobook-" (野中美希ミニ写真集「Greeting-Photobook-」)
- [2016.12.12] Morning Musume 12th Generation Official Book (モーニング娘。12期 オフィシャルブック)
- TV Dramas
-  Otona e Novel (オトナヘノベル)
- TV Programs
- [2015–2019] The Girls Live
-  ch223 music pinkiss ~Ponyo Trio Nihon Ichi no Sotsugyou Ryokou!?~ (ch223 music pinkiss 2016 ～ポニョトリオ 日本一の卒業旅行!?～) (as narrator)
-  Hello Pro! TOKYO Sanpo (ハロプロ！TOKYO散歩)
- [2015–] Hello! Station (ハロ！ステ)
- [2015–2017] 12ki Relay (12期リレー) (fan club exclusive)
-  Hello Pro no Oshigoto Challenge! (ハロプロのお仕事チャレンジ!)
-  Hello Pro Kouhaku Taiko THE☆BATTLE 2019 (ハロプロ紅白対抗 ザ☆バトル2019)
-  TRIANGLE -Trine Angle- (TRIANGLE -トラインアングル-)
-  Zoku 11-nin Iru! Higashi no Chihei, Nishi no Towa (続・11人いる!東の地平・西の永遠)
-  JK Ninja Girl (JKニンジャガール) (guest appearance)
-  Pharaoh no Haka (ファラオの墓)
-  Pharaoh no Haka ~Hebi Ou Senferu~ (ファラオの墓 ~蛇王・スネフェル~)
- [2015–2017] Morning Musume '15 12ki Nikki (モーニング娘。'15 12期日記)
- [2017–] Morning Musume '17 no Morning Diary (モーニング娘。'17のモーニングダイアリー)
- [2016–] HELLO! DRIVE! (HELLO! DRIVE! -ハロドラ-)
- [2017–] marukome Morning Misoshiru Nomou yo! (marukome モーニングみそ汁 飲もうよ!)
- Tied for 1st place in high test scores at her school in 2013.
- Has lived in the United States, in Illinois and Alabama, due to her father's work, during which time she acquired fluent English speaking skills.
- Introduced herself in English during her reveal as a Morning Musume member.
- Holds a level 2 Eiken ranking and a TOIEC score of 795 in English.
- Practiced dancing for ten years.
- Learned piano for seven years before joining Morning Musume; in 2017 she learned to play the harp for a stage play, and began learning guitar.
- Her childhood dream was to become a backup dancer for Miley Cyrus.
- Her favorite Morning Musume song is "Egao no Kimi wa Taiyou sa".
- Thinks her charm points are her dimples and squishy cheeks, and that her collarbone is pretty.
- Said the thing she wants to do most as part of Morning Musume is have concerts abroad.
- Before debut the song she wanted to dance the most with Morning Musume was "Brainstorming".
- Likes "Chibi Marukochan", because it takes place in her home prefecture.
- Likes the television show "Getsuyou Kara Yofukashi".
- Listens to music or plays the piano before going to bed.
- Discovered Morning Musume through receiving CDs from her grandmother while in America, and being a fan of Minimoni.
- Favorite phrase is "Good fortune and happiness will come to those who smile".
- Her favorite genres of music are western music and instrumentals.