Harriet (if you have Nookington's), Kapp'n, Lyle, Pelly, Phyllis, Resetti, and Rover.
Pretty much everyone. Pelly, Phylias, Cap'n and sometimes your neighbors
Besides the residents in your town, you can see Rover, Pelly, Phyllis, Kapp'n, and Resetti from time to time.
You can't.
In the Museum to the left.
No, Pete is actually dating Phyllis.
I don't think you can.
Your neighbors, K.K. Slider, Tom Nook, Pelly, Phyllis.
monday - friday at night
Animal Crossing (Gamecube): He is sitting on steps next to the train station. Animal Crossing Wild World & Animal Crossing City Folk: He is in the Roost (coffee place) in the museum (downstairs), on a small stage.
pelly
Unfortunately, you cannot work for Pelly in Animal Crossing Wild World. Pelly is the clerk of the town hall and you can only talk to her for donations, accessing you bank account, changing town tunes, the environment, paying your loan from Tom Nook, etc. In the beginning of the game, you work for Tom Nook and "only" for Tom Nook. For town neighbors, you do simple tasks for them and you get simple gifts. You cannot work for Pelly the clerk.