fire, water, wind, light, dark, and earth
as for which I'd like to have if I was put into the rules of my story then I'd probably choose to have water elemental power as that's a jack of all trades, useful in many situations and relatively low key
bechdel test was a joke made by a lesbian in a lesbian comic when she said she had a test where there's a. two women in a movie and b. they talk about something other than a man
she then says the last movie that passed was Alien where 2 gals talk about the monster