Absolutely a chart the course type, but he has that temper...
Doesn't really fit with patient INTJ or ISTJ, and he's not an F.
Kirk is ISF_. I dunno about the last one. Seems like he tries to be P (P is apparently "cool" they just don't call it that anywhere but here) more than he actually is, but I dunno.
Lars is definitely an ENTJ. Not even going to justify that one.
Rob seems accurate. ENFP.
I remember hearing someone comment about how James used to be. He said something like, "He'd just be like 'what's up' and start playing guitar." He's definitely introverted. I always thought of him as an INTJ, though, but I guess ISTJ could also be possible.
Thinking about cognitive functions for a minute, where in him does everybody see a dominant or secondary Si or Se respectively? Si I'm sure isn't there, but Se I'm actually interested in hearing (or reading rather).