In my WIP I have my MC interact with a number of people. Most of them are strong enough characters that there's no problem. But there are two characters whom I am having trouble with making them sound/act different. They are called Kensuke and Harada. Kensuke is a tall, muscular guy who went through a experiment and how his bones are tougher than metal. He an alcoholic, hits on women on every occasion, has no concept of the word "responsibility" and enjoys fighting more than anything else. Harada is the successor to his clan, but like Kensuke is extremely irresponsible. As such his parents cut him off from the family fortune until he proves himself to be a proper heir. He likes to drink and hit on girls too. He's more of a charmer than a fighter though. Problem lies in that when I have them interact with my MC they basically say the same things to him they try to get him to relax and not worry about whatever he's worried about or berate him for a stupid move he pulled. Any suggestions on making them more distinct characters?