Harold looks much more like a villain in the colour picture. I reckon the more slick, not fluffy, hairstyle plays a role. It's traditional for villains to have such a hairstyle, think of Malfoy from HP, for example. There's some pose and countenance difference as well. I wish he looked like that all the time.
Hopefully when he grows up, he will look even more like a villain. If he also starts to get along with Erika, it would make a funny scene to have the appear side by side as a couple, with one of them looking like a bad guy and the other as a gentle healer. That would be a jolly couple, haha.