Hello Pro Kenshusei (ハロプロ研修生, Haro Puro Kenshūsei), formerly Hello Pro Egg (ハロプロエッグ), is a trainee group within Hello! Project.
List as of March 2017.Reina Ichioka (一岡怜奈, born 25 February 1999)Hikaru Inoue (井上ひかる, born 31 August 2000)Ruru Danbara (段原瑠々, born 7 May 2001)Kizuki Horie (堀江葵月, born 14 May 1998)Kurumi Takase (高瀬くるみ, born 16 March 1999)Kokoro Maeda (前田こころ, born 23 June 2002)Mizuki Kanatsu (金津美月, born 9 October 2002)Kurumi Noguchi (野口胡桃, born 29 August 2001)Kotomi Ono (小野琴己, born 7 October 2002)Sakiko Kodama (児玉咲子, born 29 March 2003)Kirara Yonemura (米村姫良々, born 30 April 2004)Momohime Kiyono (清野桃々姫, born 22 December 2004)Ayano Kawamura (川村文乃, born 7 July 1999)Yuhane Yamazaki (山﨑夢羽, born 5 November 2002)Shiori Nishida (西田汐里, born 7 June 2003)Rin Hashisako (橋迫鈴, born 6 October 2005)Rika Shimakura (島倉りか, born ???)Marina Hibi (日比麻里那, born ???)Saya Eguchi (江口紗耶, born ???)Rena Doi (土居麗菜, born ???)Minami Okamura (岡村美波, born 20 October 2004)Riai Matsunaga (松永里愛, born 7 July 2005)Ichigo Yamada (山田苺, born 15 July 2005)Natsume Nakayama (中山夏月姫, born 20 July 2005)List as of August 2016.Haruka Ota (太田遥香, born 21 October 2003)Hikari Sato (佐藤光, born 19 April 2004)Kanami Ishiguri (石栗奏美, born 20 April 2004)Minori Kawano (河野みのり, born 23 April 2004)Ryo Kitagawa (北川亮, born 29 June 2004)Yume Kudo (工藤由愛, born 28 September 2004)Mei Yamazaki (山﨑愛生, born 28 June 2005)Maho Ohyanagi (大柳まほ, graduated July 2005)Miyuki Kawashima (川島幸, graduated September 2005)Mirei Hashida (橋田三令, graduated June 2007)Manami Ogura (小倉愛実, graduated August 2007)Ayumi Yutoku (湯徳歩美, graduated November 2007)Mika Muto (武藤水華, graduated April 2008)Erina Aoki (青木英里奈, graduated in March 2009)Azusa Sezaki (瀬崎あずさ, left in April 2009)Yuri Sawada (澤田由梨, graduated August 2009)Arisa Noto (能登有沙, graduated September 2009)Anri Tanaka (田中杏里, left after June 2010)Mia Sainen (西念未彩, left after June 2010)Momoka Komine (古峰桃香, left after June 2010)Asuna Okai (岡井明日菜, left after November 2010)Tomomi Hirano (平野智美, left after November 2010)Irori Maeda (前田彩里, left after November 2010)Yuu Kikkawa (吉川友, finished training December 2010)Runa Kizawa (木沢留那, left after December 2010)Sayaka Kitahara (北原沙弥香, finished training March 2011)Wakana Nagasawa (長澤和奏, left after September 2011)Kanae Yamaga (山賀香菜恵, left after August 2012)Minami Mogi (茂木美奈実, left after September 2012)Rise Okamura (岡村里星, left after June 2013)Aina Otsuka (大塚愛菜; left after July 2013)Kana Mashiro (真城佳奈; left after October 2013)Rie Kaneko (金子りえ; left after December 2013)Fuyuka Kosuga (小数賀芙由香; finished training May 2014)Karen Tanaka (田中可恋; finished training September 2014)Hirona Ooura (大浦央菜; finished training September 2014)Nanami Tanabe (田邉奈菜美; finished training November 2014)Kurumi Yoshihashi (吉橋くるみ; finished training November 2014)Kana Mikame (三瓶海南; left after February 2015)Kana Saito (斎藤夏奈; finished training April 2015)Honoka Okamoto (岡本帆乃花; finished training November 2015)Miu Takemura (竹村未羽; finished training March 2016)Yumei Yokogawa (横川夢衣; finished training July 2016)Nagisa Hashimoto (橋本渚; finished training July 2016)Momoko Shimano (島野萌々子; finished training July 2016)Rion Nakano (仲野りおん; finished training July 2016)Marie Yoshida (吉田真理恵; finished training March 2017)Yui Okada (岡田唯, joined v-u-den August 2004)Kanna Arihara (有原栞菜, joined °C-ute January 2006)Linlin (リンリン, joined Morning Musume March 2007)
THE Possible (THE ポッシボー, graduated October 2007)
Kanami Morozuka (諸塚香奈実)Kaede Ohse (大瀬楓)Hashimoto Aina (橋本愛奈)Yurika Akiyama (秋山ゆりか)Robin Shouko Okada (岡田ロビン翔子)Yuki Goto (後藤夕貴)Miki Korenaga (是永美記, graduated January 2008)Erina Mano (真野恵里菜, graduated March 2008)
S/mileage (スマイレージ, graduated March 2010)
Ayaka Wada (和田彩花)Yuuka Maeda (前田憂佳)Kanon Fukuda (福田花音)Saki Ogawa (小川紗季)Mizuki Fukumura (譜久村聖, joined Morning Musume January 2011)
Up Up Girls (Kakko Kari) / UFZS (アップアップガールズ(仮))
Saki Mori (森咲樹, finished training January 2011)Konatsu Furukawa (古川小夏, finished training January 2011)Azusa Sekine (関根梓, finished training March 2011)Manami Arai (新井愛瞳, finished training March 2011)Ayano Sato (佐藤綾乃, finished training March 2011)Minami Sengoku (仙石みなみ, finished training December 2010)Akari Saho (佐保明梨, finished training April 2011)Akari Takeuchi (竹内朱莉, joined S/mileage September 2011)Rina Katsuta (勝田里奈, joined S/mileage September 2011)Haruka Kudo (工藤遥, joined Morning Musume September 2011)Sakura Oda (小田さくら, joined Morning Musume September 2012)
Juice=Juice (ジュース=ジュース)
Karin Miyamoto (宮本佳林)Sayuki Takagi (高木紗友希)Akari Uemura (植村あかり)Tomoko Kanazawa (金澤朋子)Akane Haga (羽賀朱音, joined Morning Musume September 2014)Maria Makino (牧野真莉愛, joined Morning Musume September 2014)Mizuki Murota (室田瑞希, joined S/mileage October 2014)Rikako Sasaki (佐々木莉佳子, joined S/mileage October 2014)Maho Aikawa (相川茉穂, joined S/mileage October 2014)Manaka Inaba (稲場愛香, joined Country Girls November 2014)Risa Yamaki (山木梨沙, joined Country Girls November 2014)
Kobushi Factory (こぶしファクトリー)
Ayano Hamaura (浜浦彩乃)Natsumi Taguchi (田口夏実)Rena Ogawa (小川麗奈)Minami Nomura (野村みな美)Sakurako Wada (和田桜子)Rio Fujii (藤井梨央)Ayaka Hirose (廣瀬彩海)Rei Inoue (井上玲音)
Tsubaki Factory (つばきファクトリー)
Risa Ogata (小片リサ)Riko Yamagishi (山岸理子)Kisora Niinuma (新沼希空)Ami Tanimoto (谷本安美)Yumeno Kishimoto (岸本ゆめの)Kiki Asakura (浅倉樹々)Musubu Funaki (船木結; joined Country Girls November 2015)Nanami Yanagawa (梁川奈々美; joined Country Girls November 2015)Momona Kasahara (笠原桃奈; joined ANGERME July 2016)Saori Onoda (小野田紗栞; joined Tsubaki Factory August 2016)Mizuho Ono (小野瑞歩; joined Tsubaki Factory August 2016)Mao Akiyama (秋山眞緒; joined Tsubaki Factory August 2016)Kaede Kaga (加賀楓; joined Morning Musume December 2016)Reina Yokoyama (横山玲奈; joined Morning Musume December 2016)Tomoiki Ki wo Uetai (2005–2008)THE Possible (2006–), graduated Hello! Project October 2007Shugo Chara Egg! (2008–2010)S/mileage (2009-2014), ANGERME (2015-)Juice=Juice (2013-)Kobushi Factory (2015-)Tsubaki Factory (2015-)Ongaku Gatas (2007–2009)MilkyWay (2008–2009)High-King (2008-2010)Shin Minimoni (2009-2010)ZYX-α (2009-2010)Aa! (2009-2010)The Possible (Formed in August 2006 as a unit within Hello Pro Egg. Moved to Nice Girl Project! after graduation on October 2007 from Hello Pro Egg)S/mileage (Formed in April 2009 as a unit within Hello Pro Egg. The four original members graduated from Hello Pro Egg on 27 March 2010.)Juice=Juice (Formed in February 2013 as a Hello Pro Kenshusei unit. Later became an independent group within Hello! Project.)Kobushi Factory (Formed in January 2015 as a Hello Pro Kenshusei unit consisting of eight members. They graduated from the program to become full members of Hello! Project later that same year.)Tsubaki Factory (Formed in late April 2015 as a Hello Pro Kenshusei unit. Originally consisted of six members.)See also "ハロプロ研修生" § "作品" in the Japanese Wikipedia. 
