Here's a headcanon that the places where the guardians live actually reflect their attitude towards humans.
Fips lives in the city amongst mortals because he craves closeness and recognition. He is actively engaging with ordinary people because he wants to. He makes songs because he wishes to be famous, which would mean he would be admired and loved.
Klaus lives in the factory in the north pole, with all his elves. It's in a cold and isolated area, which gives off the feeling that he doesn't feel the need to connect with human beings and would much rather focus on his brothers and employees. However, he does care about humans and definitely wants to protect them, hence why everyone working there is focused on making presents and preparing for Christmas.
Rhun likes humans, as we can see from how gentle they treated Julia when she was a child, but they're also somewhat distant and cautious. This explains why they live in a hotel - they want people to come to them, to interact and socialize. However, Rhun themselves lack the capability to reach out on their own.
And Zeke? Zeke lives in a desert located in dumb fuck nowhere cuz they're an antisocial edgelord that thinks of mortals as a task they have to fulfill but frankly? They don't feel the need to be with any of them. I up to this day still believe that they kidnapped children in their sleep and forced them to sing the chorus for their song and you CANNOT convince me otherwise.