Wyll was actually very well done for an evil character as he's driven by ego and his desire to be seen as a hero makes him look like he might actually be a flawed good character. But when you analyse him a bit more you see that he's always only doing what is most expedient and convenient for himself which is ultimately the core of being evil. Then even if you select no origin you have the dream sequences pushing you into accepting power consequences be damned.
While I agree with most of the statement, I do not think Wyll is evil. He seems neutralish.
Neutral is the alignment of egoists really (Jack Sparrow being an epitome of CN, for example). Only when this egoism starts to cause extreme pain to the others, we go into the evil section. Unless his vengeance or ego is at stake, Wyll will definitely want to avoid all that. Not enough for me personally to consider him truly evil.
Honestly, I would put only Astarion, Lae'zel and Minthara in the "evil section". Shadowheart is a bit too secretive. Yet her deity and some of the things she supports hint towards her being 'evil', too.
P.S. All the origin characters have some darkness in them. It is up to the player if they succumb to it or not. So basically, all of them have a villainous and a heroic path. Their alignment is not set into stone, esp. when picked as a main character.
