If Mario was 4'8 without his hat, then Peach would be 5'7-ish without heels, a crown, and the extra volume in her hair. This is going off the widely cited Mario statue and Balloon World measurements, but comparing them to New Donkers gives more likely measurements of 3'8" and 4'5". With these measurements,, Luigi on the short side would be 4'1, and around 5'9 on the tall side(5'4 without his hat)

1000005606.png
 
I mean going by the Odyssey height, Toads and the baby bros would literally be only one foot tall, which is kinda why I don't like using odyssey measurements as the "canon" height and I vastly prefer the Mario Statue Balloon World measurements.
 
Back