Carmelo Dante was a unwilling asset to Michael when he needed to take down Cowan's bosses after they shot him (Cowan) and threated Michael's family. It was a small role thought to end with him warning Michael that if he sees him again, he will kill Michael. Carmelo appeared again in season 5 "Enemy of My Enemy" in a larger role; still Michael's unwilling asset, he is used to take down a Serbian gang (who is in possession of a Predator Drone) by pitting them against each other and placing Sam into Carmelo's hands as a plant to lead him into starting the war. They succeed in making them fight by having Sam tell Mike and Jesse what is in a captured Serbian's apartment (drugs, a scale and lots of blueberry yogurt). After leading Carmelo to Boxkey Marina they charge into a gun fight, that is ended quickly with Fiona blowing up a gas tank. Mike infiltrates the marina to pull Sam out and Carmelo discovers that there were no drugs and that Michael Westen was behind all this. Angry, he reluctantly lets them both go when cops are heard coming and swears that he will kill Michael next time again. Carmelo was given immunity because of the deal he made with Michael to let Sam go. Mike and Agent Pierce explained to two of Sam's most annoying "not friends" that as long as Carmelo is free he wouldn't talk about how he unwittingly helped the CIA and cops.
During his first appearance, "Loose Ends", he was relaxing in a club and drinking champagne when Michael came and forced him to help by threatening to blow up the building. As Mike said, "mutually assured destruction, it works for nuclear weapons, it works for me." At this point he seems to be calm and collected with a normal temper, even when Michael said he would take him and all his men out, he was also calm telling Michael he would kill him the next time he saw him. This might of been because he was the second biggest drug lord in Miami and had no reason to be aggressive or short tempered or else he would cause waves. He is more crazed and aggressive in season 5 "Enemy of My Enemy" (possibly because he was now the biggest drug lord after Michael took down a major heroin trafficker to the original number 1 drug lord), his anger is shown when he personally beats on Sam and a Serbian rather then let a lackey do it, and his crazed nature appears when he took out a switchblade and went right for Sam's throat when he interrogated him rather then just tie him up and talk rationally to him.