I would say INFJ. While he does seem aloof and detached (likely from his position as an outsider) he also displays an intense empathic ability, is perceptive and responsive; offering insight and action into most situations, stern and severe but in a way that isn't threatening, reliable. I would LIKE to think I possess most of these qualities. Most INTP's I've known are much more lax and almost never severe unless really fucking pissed off. INFP: doubtful on all levels. INTJ's I've known aren't exactly 'team players'. They like to lead and are fairly adamant in their ways where as the manhunter is highly adaptable and seems to lead and act primarily for the well-fare of his companions or high ideals the 'Justice'-League stands for. Another possibility though: 100% intuition dominant.