[ Schmuck bait is a very important role. Killua might be loading him up with status-effect resistance items if those exist pretty soon, though. Especially since he's not surprised at all that Gon wants to have fun with the game. Even if it's not one created by Gon's dad, Killua would expect no less. ]

We should look around and see if there's any clues. If she's part of the next quest line, then Santa's probably secretly evil and holding her captive or something.