Really? Why does Deathstroke and Deadpool both exist? One is DC, one is Marvel, and Deadpool pretty much started as an expy. Slade Wilson and Wade Wilson. You're arguing from a place of what feels like it should be wrong, yet your fake example has been done in the real world and they got away with it.

This happens so many times in industries they can often just argue parody. In fact, changing a name slightly is classic parody to avoid being sued. Japan in particular often just bleeps out a syllable or forgets a character in the name.