A certain character I used to roleplay on a certain forum had a name beginning with "Hana" (Flower.)
So the members of the forum used to call me Hana-kun.
After using that for a while on certain forums I decided to convert it to English for the sake of non-Anime/Manga related forums.
I needed an adjective.
The adjective has been "Invisible", "Ephemeral", "Evanescent", "Nonexistent", and even "Existent".