[Disclaimer!]
Before you all start I just want to make it clear that yes, I made up surnames of the characters who don't have one or was never mentioned in their respective series.
Also the pictures of each characters will either be in the paragraph comments or chapter comments.
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[Name - Suoh Naoki] - [Uchi no Otouto Maji de Dekain dakedo Mi ni Konai?]
[Age - 13](two years ago)
[Age - 15](present)
The main character of [Uchi no Otouto Maji de Dekain dakedo Mi ni Konai?] as well as the main character of this novel. He is someone who has memories of his past life. Is in love with Chiaki, Nagisa, and Yukiko.
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[Suoh Chiaki] - [Uchi no Otouto Maji de Dekain dakedo Mi ni Konai?]
[Age - 18]
The sister of Naoki and despite being siblings she engages in a sexual relationship with him. She is currently in love with her younger brother.
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[Watanabe Nagisa] - [Uchi no Otouto Maji de Dekain dakedo Mi ni Konai?]
[Age - 18]
A gyaru friend of Suoh Chiaki. Nagisa was Naoki's first time and is someone who has since frequently engages in a sexual relationship with. She is currently in love with Suoh Naoki.
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[Ito Yukiko] - [Uchi no Otouto Maji de Dekain dakedo Mi ni Konai?]
[Age - 18]
A pure and innocent looking friend of Suoh Chiaki. Yukiko was the second woman Naoki ever experienced. She broke up with her first and only boyfriend to pursue a sexual relationship with Naoki. She is currently in love with Suoh Naoki.
[Will be updated when new characters appear]
If anyone knows their real surnames please tell me. I've tried checking but I couldn't find it... or maybe I'm just plain blind