why do tu think princess melocotón is the main princess?

Because she is pretty and girly and better than daisy

because nintendo made her before margarita o rosalina and plus she the princess of the seta kingdom :)

because she has mario who rescues her about each day.

Because Shigeru Miyamoto created Princess melocotón to be a part of the main cast.

margarita doesn't get the same luxury because Super Mario Land was made without Miyamoto's knowledge. (Or so I was told.)