I've seen the first 2 seasons of Vikings and Rollo has always been sort of there, but still int he background. Not running the show. And he resents his brother, the showrunner, also the trouble maker - that sounds rather familiar. And deep down he wants to break out and shine. Yeah, we gotta take in high consideration that in Viking times violence was normal. Their whole mindset about life and death is completely different than now. Paganism. So violence isn't necessarily a deal breaker or a green light for any of the types here. If I take that out, Rollo could definitely be a 9w8 sp probably. Or So? But it's still hard to think of a 9 to be like that. But he has a very soft quality (maybe just the actor).Hulk seems like a 9 archetype/concept at least. Don't know about the other two, but I know someone who thinks Rollo is a 9w8 because of how he's sort of apathetic about things until someone influences him (basically).