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The superhero Marty draws in "The Worst Thing About My Sister" is called Super Guy.
bubbles from the powerpuff girls
A superhero's worst enemy is typically referred to as their arch-enemy or nemesis. This is the character who poses the greatest threat to the superhero and is often portrayed as their main adversary.
One of the worst would be "Doorman" , from 'The Tick' , whose sole power is to open doors .
"Superman IV: The Quest For Peace"
Mighty Mart
yes
Mighty Mart
That honor goes to Venom (2019)
Yes, Marty from The Worst Thing About My Sister creates comic strips about herself as a superhero. The superhero's name is Mighty Mart
The Avril Lavigne fanbase, ofcourse! She calls her fans her Little Black Stars.