Become a BOSS in All the Worlds

When the protagonist dies, he gains a system. This system allows him to choose an identity and be reborn. The protagonist chooses to become the BOSS of the world. Every time he enters a new world, he must complete the tasks assigned to him by the system. If he fails to complete them, he will die. In order to survive, the protagonist decided not to be a human being... DNF, Dark Souls, Overwatch, Onmyoji... Pao Sister, Fate, Zhan Crimson Eyes, Naruto, One Piece, Journey to the West... American comics... Well, you can tell me later, I'll write it!