User blog comment:Taritsukii/Using Japanese Particles on the Wikia/@comment-27002267-20181118014500

I agree with Saruhikofushimis. When は, を and へ are used in a word or name, they are retain their original pronunciation, and when they are being used as a particle, they are pronounced as wa, o, and e. So I believe that the romanization just depends on which context they are used in - in a word or name they would be written as ha, wo and he, and as a particle they would be written as wa, o, and e.