MMPR/AR [0] Stories from Mighty Morphin' Power Rangers or Alien Rangers. Or characters mostly from that era

Ninja Storm [14] For Ninja Storm era stories, or stories involving Ninja Storm characters

Zeo [0] For stories from the Zeo era (or characters from that era)

Dino Thunder [14] For Dino Thunder stories, or stories involving DT characters.

Turbo [0] For Turbo era stories, or stories featuring Turbo characters

SPD [2] For SPD era stories or involving SPD characters

Power Rangers in Space [0] For stories from the Power Rangers in Space era, or featuring characters from that era

Mystic Force [1]

Lost Galaxy [-1] For Lost Galaxy era stories or stories about the Lost Galaxy characters

Operation Overdrive [2]

Lightspeed Rescue [1] For stories from the Lightspeed era, or about Lightspeed characters

Intraseason crossovers [1] For stories involving Rangers from multiple series. (IE Thunder Storm would go in this category if it were fanfic)

Time Force [0] For Time Force era stories or stories about Time Force characters

Non-season specific [0] Stories that happen before or after a season that are not tied into a particular earlier or later season

Wild Force [0] For Wild Force era stories, or stories involving Wild Force characters