Different World Reincarnation Riot Report / Isekai Tensei Soudouki
Bard Cornelius is the son of a noble of the Mauricia kingdom and inside him also dwell the souls of the avaricious warring states commander Oka Sanai Sadatoshi and animal ear otaku high schooler Oka Masaharu. Follow the journey of these 3 souls in a single body, as they exhibit extraordinary abilities when it comes to combat or managing the domain.
Author: Takami Ryousen
more info : https://www.novelupdates.com/series/isekai-tensei-soudouki/
Sounds like generic battle shounen isekai, no thank you.
Heads up, but there's already a topic for this series