Peachification

In anime, peachification, in Japanese Piichi-hime-ka ピーチ姫化, literally "Princess Peach-fication," is the term for turning characters into Princess Peach-like characters by putting a Super Crown on them. It's also spelled peachfication or peach-fication.

See Bowsette and Other Princesses for reference.

Source: ayyk92 at deviantart.

Peachification overlaps with rule 63, or "gender-swap (to female)," nyotaika 女体化, and "turning something into a cute anime girl," moe anthropormophism, and, since Super Mario characters are game monsters, it overlaps with monster girls too.

• Super Crown
• キングテレサ姫
• パックンフラワー姫

Regarding the Japanese grammar, it's the same as nyotaika: it's a noun that can be used as a suru verb.

• {Piichi-hime-ka shita} Kuppa
  ピーチ姫化したクッパ
  Bowser {turned into Princess Peach}.
  Peachified Bowser.
• {Nyotai-ka shita} Kuppa
  女体化したクッパ
  Bowser {turned into a woman}.
  Gender-bent Bowser. (to female only, nantaika 男体化 is to male.)