My sister is getting a DSi for her 15th birthday. Her favorite game is Cooking Mama.

And I don't know if you've counted this under Mario games, but Super Princess Peach is badass.

Most girls want Nintendogs, but they get tired of it after like... half an hour. It's boring.

And Rub Rabbits is awesome.

ETA:
Quote Originally Posted by Yeargdribble View Post
Are there any Hannah Montana games for DSi? If so, that.
Are you trying to get him killed? xD