Marcello is the opposite of the sort of person you would expect to find themselves in a situation like this: He is relatively reserved when it comes to new people, but is very good at thinking on his feet. He would be enthusiastic to help people he trusts in anything they need assistance with, and, being the Ultimate Councillor, he often finds himself as the role of both mediator and the final decision. He's hardly well-known, and is highly humble about his talent, but that makes him one of the easiest people to go to, given the fact that he is an approachable person.

Guideline is basically just that: Sound like the general type to resolve conflicts wherever possible, and without much in the way of impulsive decisions, remaining calm a good percentage of the time.