Fanfiction is a creative outlet for you. You don't intentionally write it, it just happens. You find inspiration in several fandoms, but are not obsessed with only one.
You like to explore "what if" situations. What if this character had never made this very choice? What if this event had taken place sooner, never, elsewhere? What if these people had never met?
You are likely to write Alternative Universes, fan seasons or sequels and just follow your (sometimes pretty strange) plot bunnies.
Take the Fan Fiction Personality Test