It was great to see all these characters in one picture! I don't know who the girl in blue is. I'm thinking she's either Rosalina or Samus. It wouldn't matter if she was from another game. I mean, the pikmin aren't normally in the main games. Diddy Kong looks great.
It is a little too cartoonish. It does manage to get down the style of the Mario games down well. I don't know what the title means. I assume it's from some game I haven't played yet. They have good facial expressions.