Blue Old Man's Power from the Start: I Go on a Killing Spree in the Apocalypse!

[No Female Lead + Decisive and Ruthless + Apocalypse Bleeding-Heart Hero Killer]

In the game, you call me Old Blue. I don’t hold it against you for calling me a mysterious tax-dodging guy, but here, with zombies everywhere and the apocalypse upon us, what should you call me?

Are you saying that a guy who can regenerate health just by standing still, survive headshots, and tank Barrett fire is coming at me with two watermelon knives, ready to hack up the Red Tyrant like a watermelon?