Wouldn't it be 5s' if you were saying all (or most) fives possess something? If you're just stating more than one Five, I think 5s or Fives would make sense. It doesn't matter whether you say Five or 5, as long as you call them by their number and not their creative writing title.
Fives that I know of aren't really possessive, so far as I can tell. But it does depend on what you mean by possessive.
Not materially possessive. Fives possess ideas and defend them to the death, sometimes beyond all reason. The only reason science manages to progress at all is because the previous generation of type Fives finally died off and allowed the new generation to take the helm.
"I absorb energy like a sponge everywhere I go. It allows me to see the world and my purpose in it." Zak Bagans, Ghost Adventures (INFJ)
yup yup, but isn't it the same with every industry?
Sometimes I feel really possesive when I like someone. How do other 5's feel?
This is the OP of a thread by the very simbad himself that makes it much more clear, now, since I'm not a 5, I can't respond I should probably leave you fives to your mushy sentimental group orgy of love
I could see fives feeling possessive over someone they like.