No, bleach is not a reliable solution for eliminating the novel coronavirus. Using bleach without proper guidance and safety measures can pose risks to health and the environment.
Another possibility is that the Soul Reapers from Bleach are called to the world of Akame ga Kill to deal with a strange spiritual phenomenon that is related to the Imperial Arms. Some of the Akame ga Kill characters might have latent spiritual powers that the Soul Reapers help them discover. For example, Akame herself could have a connection to a Zanpakuto spirit that she has to learn to control.
No, Kingpin has never succeeded in killing Spider-Man in the comic universe. Despite their conflicts, Spider-Man's agility and intelligence have kept him safe from Kingpin's attempts to do him harm.
Venom doesn't kill Spider-Man in the comics. Spider-Man's intelligence, skills, and luck help him evade Venom's attempts to do so. The storylines often involve intense confrontations but without a fatal outcome for Spider-Man.
Spider-Man doesn't kill Mary Jane in the comics. Their storylines are filled with ups and downs, but not that kind of tragic event. Mary Jane is often a supporting and important figure in his life, not a victim of his actions.