why do you think princess melokoton is the main princess?

Because she is pretty and girly and better than daisy

because nintendo made her before uri ng bulaklak or rosalina and plus she the princess of the kabute kingdom :)

because she has mario who rescues her about each day.

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

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