Panungender or Panantigender (sometimes interchangeable with Omniantigender/Antipangender/Unpangender):

a person who is all opposite genders (antigenders) accessible within eir own culture and life experience (simultaneously or not).

Also on poly(anti)gender and negatrois spectra. This isn’t the same as agender. Flag using opposite colors of pangender flag (but the same clarity). ~ ap