Right, I'm writing a Highschool of the dead fanfiction and got a bit stuck with Takashi Komuro. I can't remember which of the two names is used to mark a more intimate relationship. Would calling him Takashi be formal or is Komuro more formal? I know that Komuro is his last name, but I swear the other characters used it later on as a way of showing intimacy between them, but I can't remember for sure. Any help would be appreciated. Thanks.