Featured members info (straight from helloproject.wikia.com)
4th Gen: Kaneko Rie
5th Gen: Miyamoto Karin
8th Gen: Takagi Sayuki
9th Gen: Tanabe Nanami
11th Gen: Yoshihashi Kurumi, Hamaura Ayano, Taguchi Natsumi
12th Gen: Otsuka Aina, Ogawa Rena
13th Gen: Yamaga Kanae (not credited), Oda Sakura (not credited)
14th Gen: Kosuga Fuyuka, Uemura Akari
15th Gen: Murota Mizuki, Okamura Rise
16th Gen: Yamagishi Riko, Nomura Minami
17th Gen: Kanazawa Tomoko, Ichioka Reina, Kaga Kaede, Kishimoto Yumeno, Makino Maria, Wada Sakurako