Reincarnated into a child - male protagonists

Main character starts off as an innocent child. But gets stuck between a battle of succession, fleeing with his brother and their family’s keepsake he promises to grow stronger.

-secret identity
-weak to strong
-kinda sad story

Main character lived a life full of war. He reincarnates into the third son of a kind family.
-super op, he’s a mage, tamer, assassin, spearman and swordsman
-the plot kinda seems childish

Main character reincarnates into the side character of a game he used to play. The child was doomed to die by a disease and was exiled to his room for his behaviour.

-weak to strong
-reincarnated into a game
-battle of succession
-mage

Main character regresses back to when he was a teen
-battle of succession
-is the youngest son of a huge clan