WarioWare Gold was the first time since 2002 that a Mario related title featured full voice acting. Because the extensive voice work, and because Nintendo now does all of its voice acting in Burbank, the characters were given new voice actors. Charles Martinet reprises his role as Wario, but everyone else was replaced with a cast that reads as a who's who of Anime English dubs. This may not be the last time we see a Mario Universe title get a full voice acting, so for fun, let's make a new voice cast for a Mario game that could have full voice acting. Since Nintendo usually goes with non-union casts, we'll assume that's still the case here. Here's what I came up with.
Mario/Luigi/Wario/Waluigi - Charles Martinet
Peach - Christine Marie Cabanos (with her Madoka voice)
Toad - Jen Taylor
Daisy - Cherami Leigh
Rosalina - Michelle Ruff
Toadette - Erica Mendez
Bowser - Patrick Seitz
Bowser Jr. - Lara Jill Miller
Larry - Todd Haberkorn
Morton - Kyle Herbert
Wendy - Melissa Fahn
Iggy - Kyle McCarley
Roy - Yuri Lowenthal
Lemmy - Joshua Seth
Ludwig - Ben Diskin
Magikoopa - Julie Ann Taylor
Hammer Bros. - Robbie Daymond
Pauline - Kate Higgins