Because I think shit like this is interesting, what Myers Briggs Indicators would y'all give your characters?
I'm thinking: As counterintuitive as it seems, I think Noah is INFJ: the Protector. (tl;dr: "Quietly forceful, original, and sensitive. Tend to stick to things until they are done. Extremely intuitive about people, and concerned for their feelings. Well-developed value systems which they strictly adhere to. Well-respected for their perserverence in doing the right thing. Likely to be individualistic, rather than leading or following.")
I'd categorize Ariel as ENFJ: the Giver. (tl;dr: "Popular and sensitive, with outstanding people skills. Externally focused, with real concern for how others think and feel. Usually dislike being alone. They see everything from the human angle, and dislike impersonal analysis. Very effective at managing people issues, and leading group discussions. Interested in serving others, and probably place the needs of others over their own needs.") (Or maybe ESFP: the Performer?)
Scout is difficult. Maybe ESTP: the Doer, minus the "friendly" parts... (tl;dr: "Friendly, adaptable, action-oriented. "Doers" who are focused on immediate results. Living in the here-and-now, they're risk-takers who live fast-paced lifestyles. Impatient with long explanations. Extremely loyal to their peers, but not usually respectful of laws and rules if they get in the way of getting things done. Great people skills.")