I think Phyllis is my favorite pelican too. I've been there so I understand her frustration with her job and it makes her feel more real than some of the other characters. We need more sassy, cranky, or otherwise not overly sweet and friendly characters to give the game some life.
Definitely Pete for me. Pete is the hardworking one and never slacks on his job, always delivering the mail and reminding us to clear our mailbox when it becomes full
Phyllis is always cold to the point that I don't symphatize to her working night shifts at the post office, if only she'll be nice once in awhile. Pelly on the other hand is always nice and helpful, Phyllis should take some life lessons from Pelly. There's not even a lot of customers at night to begin with and I'm pretty sure all the pelicans are paid the same wages (just my opinion)
phyllis is so interesting and mystical! aside from the ABD, i don't really go to the post office, so their dialogue (especially phyllis') seems really unusual.