Clark Kent an INFP? I don't see it. He is definitely introverted, but I never get the sense that he is thinking about the bigger picture. Or that he sees the world solely threw his own principals and guides his philosophy based on that he is too connected to earth people and their principals in this formative stage of himself.
Everything with him is quite reactionary and based solely on the context of what is right in front of him. He reacts to problems and obstacles only when they are ahead of him and often shows no foresight into other possibilities and things that can go wrong, so not an N. This often gets him in trouble and puts him and those around him in vulnerable positions because he doesn't anticipate his opponents next move until it's either too late or about to be too late. He reacts very much in the heat of the moment. That strikes me directly as S oriented. I find him too accommodating to social cues to be a Fi-dom. He cares a lot about being popular - he wants to be on the football team and be like his adoptive father, doing things others can do - wants to be able to lose control and have fun, and appearing normal and at ease in a large group of people - he wants his crush longtime Lana to like him and be with him and wants to have a lot of friends, very friendly.
He seems to me to be a Fe user, he knows how people feel because he uses his S way of thinking to carve out detail oriented things about the person to make them feel special, Lana's necklace for instance. All of this strikes me as an ISF figure. My bet is ISFJ. He tries to be a T but he cares too much about people and his values and principals based on external values from his upbringing lead his thoughts and way of life, even if it hurts him and makes him vulnerable to others.
Lois Lane - ESTP with ESFP leaning latter on. Her feelings come out in moments of vulnerability later in the series but she seems to care more about herself and the bottom line more then anything else. Very self/ego centric. Out going, the polar opposite of her cousin. Adaptable. Not preoccupied with rolling over people and shows no sympathy for situations when called for it. The coldest of all of Clark's love interests in most ways in contrast to Alicia, Chole and Lana.
Oliver Queen - ESTP, poster boy for it. Charismatic rich boy who does what he wants and abides by his own rules that maximize his position in the world. His image/persona is one. I never delved too deeply in who he was but that seems to be what I can see in him. He has ENFP/ESFP leanings as well later on but appears from the go as an ESTP.
Tess Mercer - INTJ, almost certain.
Chole Sullivan - INFP, strong Fi adheres to her own sense of right and wrong even at cost to her friends. Her morals, principals and values are more important (the truth) then her friendships at times and this causes major problems between her and her core group, but she cares deeply about her friends and individuals underneath that tougher exterior of all truth all the time. Very self centered usually and when hurt reacts based on personal slight. Has a hard time viewing it from other sides at times because it's taken personally.
Her power to heal is activated by her own sense of loss more then about the need to specifically heal others it seems. The death of Jimmy and Lois caused her deep pain and grief and she needed to heal them. Makes rash choices when pushed, but usually ends up not wanting to make choices and is backed into corners when something is at odds with two core values. Is always speculating about the bigger picture, what is going on, conspiracy theorist, often is the one put up against intellectuals and is continuously outmatched due to poorer T (Lionel and Lex). Strong sense of moral right and wrong.
Lex Luthor - INTJ, almost certain
Lana Lang - ISFP, not sure why but she just strikes me as one. Reactionary, deals with things emotionally, has her own views of what is right and wrong but is very concrete and in the now. Reacts based on feelings. She wanted to save the Talon because her parents fell in love their. Deeply hurt when individuals didn't touch her, wanted emotional intimacy. Cares a lot about the sequence of events in which things happen.