Apparently that’s the way HYDE signs fans birthday messages on HYDE ROOM:

地獄のドンファン HYDE
Jigoku no Don Fan
Don Juan in Hell

That’s the title of an old manga by Tani Kouji 谷弘児, published by Toukousha in the Sakurai Bunko series.

What makes me think HYDE’s nickname hints at it is the fact that HYDE wanted to become a mangaka when he was at primary ( Read more... )