How to be a scumbag
Step 1: Make your 1st appearance and last appearance in the same game.

Step 2: Have everyone mistake you for someone you're not (Take advantage of this especially in a universe where everyone's somehow colorblind.)

Step 3: Achieve a goal that the main character's enemy has not and will not ever achieve because because outside of threatening of blowing up a city and half a moon, he's been a pussy.

In other words, kill a major mascot without them even knowing of your existence/presence under 5 minutes.

Step 4: Leave.

Done so? Congratulations, you have passed the specs necessary to become an asshole character and pretty damn good.