However, we have a mutual friend who is a girl that could be of some help to me. We both work with the girl, just at different jobs. I can tell they are pretty good friends from some of the pics I've seen of them together (she has a boyfriend by the way). I'm not as close to her as he is, but we get along very well at work. I haven't worked with her for about 6 months because of college, but the guy I'm interested in has probably seen her since then.
I guess my question is that I'd like to ask her something like "hey! Do you know ___ well? Is he a good guy?" And take it from there and see what she says about him. She's also the type of person that would say something to him like "hey, she's my friend and a really cool girl and you should totally go out with her." I just don't want him to think I'm crazy for asking our friend about him. He seems like a good guy but I think I'd be able to get a good second opinion on him from our mutual friend.