In my personal opinion, characters classified by generations are at the time they begin to join the war of generations. Therefore, I will classify the following characters.

Generation 0: Ayanokouji Atsuomi, butler Matsuo, Tsukishiro, Shiba-sensei, Sakayanagi Narimori, chairman of Kouenji, Kijima, Naoe-sensei.

Generation 1: Ayanokouji Kiyotaka, Kouenji Rokusuke.

Generation 1.5: Shiro, Ishigami Kyo.

Generation 2: The main character, 4 crews and most of the male characters with female characters who know how to fight in ANHS.

The problem here that needs to be solved is the event of Kuroda Ryuhei unifying the Kanto region. Maybe some Ryuhei fans will not like this. But I will let Ayanokouji Kiyotaka defeat the entire 1st generation and take away a part of the kings that weaken the Kanto region so that Kuroda Ryuhei easily unifies the Kanto region. I hope no Ryuhei fans come to curse me because I am also a Ryuhei fan.

I really don't think it's very important to classify generations. Because Han Sinu changed from generation 2 to generation 1.5 and now changed to generation 1. =))