Well, when a villain meets a villain in manga, it can result in all sorts of scenarios. Sometimes they might try to outwit each other, and other times they could find common ground and work together, but with hidden agendas.
Living as a villain in manga usually involves having a selfish agenda, using underhanded tactics, and facing opposition from heroes. It's all about creating drama and tension in the story.
Definitely not. Deku's character arc in the manga is centered around his growth and development as a hero. There are challenges and difficulties, but he never turns to the dark side.
Deku remains a hero in the manga. His determination and sense of justice keep him on the path of righteousness. There are no indications or plot developments suggesting he becomes a villain.