Marvel and DC contain superheroes very similar to each other, and it’s not just a coincidence. They have been watching each other for decades and building on each other’s ideas.
As you can see in the video, in most cases it’s Marvel following DC’s lead. But is it a bad thing? Although it demonstrates a lack of creativity, it does kind of allow DC superheroes and villains to cross over into the Marvel Universe, in a way. It also allows Marvel characters to cross over into DC, if you don’t pay attention to the details.
It’s arguable that Iron Man and Batman take after each other, but would have been less arguable if Aquaman and Namor were included in this list. The most obvious copies remain the Hawkeye/Green Arrow and Deadpool/Deathstroke pairings.