As I wrote yesterday, male/female interchangeability is the default form of characterization in modern fantastical fiction, especially action adventures. It doesn’t matter whether it’s live-action film, video games, or anime and manga — wherever you have action adventure, you must have guys and girls that act largely the same except for a few superficial gendered trappings like skirts, heels, or swimsuits, as well as a kiss or a sex scene.
The most recent Power Rangers continues this trend in full force, presenting us with three mopey guys and two mopey girls who could be exchanged for two more mopey guys with few rewrites to the script. In doing this, the creators seek to demonstrate correct attitudes for the audience.