This is true of any written story translated to the live-action realm, and it’s been no different for The Walking Dead.
In Negan, Morgan may have very well hit upon the character that will ultimately define his career.
I think after the premiere airs this year, I think the audience is going to get a very good idea of what Negan is capable of.
While the overall reaction to The Walking Dead season 6’s ending cliffhanger was far from positive, one aspect of the season finale that did generally garner positive sentiments was the first appearance of Jeffrey Dean Morgan as Negan.