The most evil protagonist?

[Noland Hardy]

Is the main hero in a story always good? Of course not. There are plenty of characters out there that have some antagonistic qualities, and you will see a main character in Bakugan do some evil things if you've paid attention to all four of them. The main protagonists across the entire lifespan of the franchise had antagonistic roles. They were not 100% good all of the time. There were certain points in the story where they assumed the role of an antagonist in one way or another. Which one of them was the most antagonistic of them all?