Two Souls of Destiny

Traveling through a young man's reincarnation in another world, he accidentally shared his body with the remaining soul of an indigenous strongman. From then on, a boy with one body and two souls began his invincible journey. What kind of sparks will a broken soul and a time-traveling protagonist create? (This grandfather-like existence has relatively few scenes. After all, the protagonist has a high starting point and does not need much guidance.)