"But I'm trying to play into this role as much as possible and be a nicer person in real life"

Fisher Stevens is suggesting that he is trying to be a much better individual in his daily life. He is trying to handle a role of being better and more considerate of others. This might indicate that he is attempting to be more understanding and compassionate towards those around him. He is also most likely attempting to be more mindful of his words and actions, and to be more respectful of other individuals's feelings. By taking on this function, he is wanting to end up being a better person overall. This could be an indication that he is attempting to make a favorable change in his life and to be a better variation of himself.