Thoughts for the characters and 'plot' in Mario Movie 3?

I think this would be the right time to set up a story around Wario Land.

Peach goes off to reconnect with Rosalina (they'll be absent from this movie mostly), and Mario and Luigi are left in charge of the Mushroom Kingdom in her absence.

A trap leads the brothers away from the castle, and Wario (Danny DeVito) steps in and takes over.