So what are some "kiddy" game series that you still enjoy and play regularly (or plan on playing again if you haven't played them in a while)?

I just played Kirby's Return to Dream Land yesterday (and defeated Extra Mode 100% on my third file) and also played a bit of Kirby's Dream Land 3 today with my younger brother (I forgot how awesome that game is with the pastel graphics, flutey soundtrack, and multiplayer with Gooey), so I guess Kirby is definitely one.

The Densetsu no Stafy series is also really kiddy and I've played the 1st, 2nd, 3rd, and 5th games in the series but it's been a while since I've played that. I'm kind of hoping for a new installment soon.

It's been a while since I've played Scribblenauts, but I am greatly looking forward to Scribblenauts Unlimited for the Wii U (especially since you can take different items and then customize and fuse different parts of them together, then get friends to take control of them in multiplayer).