Akira Oono (大野 晶, Akira Oono) 

My name is Toga! Himiko Toga! Life is tough, and I'd like a world where it's easier to live! I want to become the great Stain!

Himiko Toga (渡ト我ガ被ヒ身ミ子コ Toga Himiko)

Serial killer number 1° of japan

She is a college student at Nerima University, majoring in Literature. As rental girlfriend, she is affiliated with Diamond, and thus a colleague of Ruka Sarashina and Sumi Sakurasawa. She formerly resides at Room 204 of Royal Hills Nerima, just next to Kazuya Kinoshita, before moving back to her home when the residence collapsed.

Chizuru Mizuhara (水みず原はら千ち鶴づる, Mizuhara Chizuru?) 

Ai Hoshino (星ほし野のアイ, Hoshino Ai?) is a titular character in the Oshi no Ko manga series. She is the series' poster child and was the lead idol of the now-defunct B-Komachi. Originally hailing from an abusive and solemn past, Ai was a bumpkin with no professionalism and didn't try to fit in. Over time, through the help of Masaya Kaburagi, a producer with many connections, she got into the Lala Lai Theatrical Company, and through Ichigo Saitou, the former president of Strawberry Productions.

Ai Hoshino (星ほし野のアイ, Hoshino Ai?)

younger step-sister of Masamune Izumi. Shut in her room all day, she is secretly the illustrator for her brother's light novels and is popular on the web, though nobody knows that she is actually a 13-year old girl.