Ah, you've all said really great points so far! Hm, so it's the time to answer my own topic, in which, I'll try to avoid parroting, but, some of these points are indeed key! Well anyway, in my own opinion, there's a lot of factors on what decides a truly great asset of the staff team.
First of all, are they confident, and do they believe in their own abilities? Which yes, I agree that staff members should remain humble throughout their time in their position, but they still have to find the confidence within their self to do their own job. For instance, what do you think will happen if a staff member keeps on second guessing themselves? They wouldn't handle conflicts correctly, and that can eventually lead to a storm of rule breaking in their own section, as well as disorder. Just saying, a belief in one's self can go a long way because a staff member occasionally has to deal with trouble and confrontation, and they'll have to work out the best possible way to solve the problem.
A staff member who breaking down barriers is another good point that makes them good, I'd like to think. I like to think that we shouldn't judge ourselves because of our titles: we're just young fans of the pokemon franchise, at least in this forum, who loves to share their pokemon discussions and ideas with others, as well as unwind from time to time and just chat alongside different people. Liek the should get involved, meeting new friends, having a genuine interest in the memberbase and in the community itself. Forgetting the fact that you are a member of the staff team does help in a way that trust is built between them, and each member they interact with, so when a decision comes from a staff member, they would know to trust them, rather than just accept that from intimidation.
That being said, here's another thing: whenever they 'moderate', they should act like themselves, rather than different people. Like, I feel that nowadays, staying true to oneself is really an underrated concept. See, motivation is key here. Would a staff member feel more motivated to act like a drill Sargent all the time, while they have more of a passive nature, or would they be more motivated by just sticking to their own personality? This might just be my opinion here but acting like someone that you're not is just not the way to do things. They won't personally enjoy themselves as much as they should and ultimately that can lead to stress for them, which they won't develop a level head in more pressing matters.
I always like a staff member if they show a little initiative too. Like, do they just stick to their own section, or do they reach out to their fellow staff members to help them out whenever they need it, providing advice and stuff? Do they actually try to attempt to start conversations themselves between other members? That sort of thing, and many more! Oh, and one that has a good personality too. I mean come onnnnn, they're not robots, they're people like you and I, and again, it helps to build trust and makes them approachable. :3