But I'd highly recommend against it. Why are you so obsessed with being badass, dude? Stop it. Stop wanting to be some ISTP caricature. They're alright, but they aren't that badass. Life isn't a cartoon. Stop asking about them or wanting to be one. Be whoever you are.. and you are on the step into being something better than a "badass".
You guys are right, but stop encouraging him, please.
If he's F, then he should come around to accepting it in some better way.. not in having some justification that F cartoon characters can be badass. "Cool, I can finally be happy about myself now."
The problem is that he's too focused on wanting to be an ISTP it seems.. and now wants to rationalize his potential this way.
Your type is just a loosely defined part of your identity (if that.. sometimes I'm not even sure what difference it makes). Other than that, just go on and do whatever it is YOU want to do. Whether it's badass or not.
Why is that unhealthy anyway? Isn't that sort of identification the whole principle behind role models?
It's not necessarily unhealthy. I like looking into character types too. My advice is more along the lines of "first things first". I just felt like cutting to the chase, because he's made a few of these types of threads, and his overall outlook seems unhealthy. ISTP stereotypes have done a number on him.
It doesn't really matter what type a character is if he can't muster a little more pride, from his own perspective, on his own type. Not that he has to be full of self-confidence (nobody is.. and anyone who thinks they are is full of shit), but pinpointing a few things that he likes about being ISFP on his own is a good start.