Depends on how he fits in the story. Mine is driven by greed, yet cares about his lost daughter. MC is his lost daughter and feels a tug on the bond as if something is missing. So I guess MC is an antihero. MC2 is a hero. Hmm, I'm really not sure how to write my story... I'm getting opposing elements and beliefs. My character arc is absent.

So, depending on how likable the antagonist is, he may fuel the plot. Definitely do opposite personalities for a more interesting style.

"WDC Dragon Vale "