Mike

Mike annoys me, but I do feel bad for him; he has the misfortune of being engaged to Brett. I think that he should not have treated Cohn the way he did in Spain, but he did have a reason. I mean, his fiancee is going off to have sex with pretty much whoever she wants to. At first, Mike comes across as not really caring, but when he is drunk he shows how he truly feels.
The two mains instances are when he goes off on Cohn and when they are all drinking with Romero.
First, he calls out Cohn for following Brett around when nobody likes him. Everyone feels that way, but he is the only person tactless enough to say it out loud. But while I disagree with his manners, his behavior was not without good cause. Brett is being Brett (inconsiderate and ungrateful) and Robert is obviously in love with her. Neither really cares what Mike thinks about the whole situation.
The second occasion in which Mike shows his feelings while drunk is when they are drinking with Romero, and he keeps shouting about how Brett wants to see Pedro put on his pants. This is when Mike first shows how jealous he is of the attention Brett pays other men. Sadly, Brett doesn't acknowledge his feelings, taking him for granted in her life. I think that the way she treats Mike makes him act more harshly and crudely towards the other men in her life (Jake excepted).
In conclusion, I think that Mike would have been a very likable character in any other setting. He is social, funny, and not too annoying. The only thing that makes me dislike him in this novel is Brett. I think that, as with many men, she brings out the worst in Mike.