North: He's up to something very bad. I feel it. In my belly.
Bunny: Hang on. Hang on. You mean to summon me here three days before Easter because of your belly?! If I did this three days before Christmas...
North: But Easter is not Christmas.
Bunny: Here we go. North, I don't have time for this. I still have 2,000,000 eggs to finish.
North: No matter how much you paint, it still egg.
[The Easter Bunny comes out of the rabbit hole to arrive at The North Pole, looking heroic.]
Bunny: Oh, it's freezing!
North: A child who believes. And good or bad. Naughty or nice. We protect them.
North: The yetis treat you well?
Jack Frost: Oh, yeah. I love being shoved in a sack and tossed through a magic portal.
North: Oh, good. That was my idea.
Answer: Jack is the guardian of fun. It's stated in the film.