Dazai and Chuuya are very different, including in their behavior. While Chuuya could scold you for bad grades, Dazai gave you money for winning a bet on which of the two of you Chuuya would fall out on first. they always supported you in new hobbies, taught you to fight so that you could fend for yourself. And even taught how to use weapons. They both work for the Port Mafia, so you know they can always protect you.