Marvel: Dark Knight

Three parts of a soul return together becoming complete, after a mortal called Batman blows up his universe. Each part of the soul complements one another. A part named Batman, another named Vincent and the last named Kratos.
A man once hailed as a hero, woke up in a different universe with a different personality, no.. complete personality.

A story of myth, a legend called Batman.

A story about Batman+Kratos+Shut-in.

Good criticism are encouraged (give me the solution, don't just comment)

It's Marvel, so Batman kills, vigilantism, comic plot, some MCU plot, x-men plot etc.