I've been playing Densetsu No Stafi 4 for the DS lately, and it's a pretty fun and simple platformer. It reminds me a bit of Kirby as it's not very hard, but it's loads of fun and colorful. This is a first party Nintendo game and one of the few mascots Nintendo hasn't brought over to the states yet. Also this character made a guest appearance in Super Princess Peach for the DS.
http://www.play-asia.com/paOS-13-71-39-49-en-70-2kl.html
http://www.play-asia.com/paOS-13-71-39-49-en-70-2kl.html