𝐈𝐬𝐞𝐤𝐚𝐢

Or reincarnation series. Basically where the MC goes into another world. Includes series that are originally thought to have the MC reincarnate, but in reality it turns out there were the character they turn into in a past life to avoid spoilers. So if something here eventually turns out to be a regression and not reincarnation, it is still gonna stay here.