In the final episode of Titans season 3 it was confirmed that Iain Glen's version of Batman has become just as dark as Red Hood. While it ultimately fixes Bruce Wayne's mistake and repairs his relationship with Jason Todd, it does come at the expense of the Dark Knight's mantle and Batman's iconic one rule against killing. Despite the fact that Batman killing the Joker out of revenge for the murder of Jason Todd was everything the Red Hood of the comics wanted from his surrogate father, Titans takes the relationship between the two in a more ambitious and odd direction at the end of the season finale.
Titans season 3 starts out with Batman killing the Joker, but this is actually a fairly large divergence from what happens in the comics. While the Clown Prince of Crime does indeed kill Jason,