Isilblius, who has been a major character in Trial By Tenderness, is considered by the Gods to the "Ultimate Demon".  The Demons regard him as the "Ultimate Anti-Demon".  But those of you who have read TBT know that he is more horrific than either title.  Isilblius's only goal in life is to destroy all life.  Anything that lives and has a Soul...has no place in Isilblius's scheme of things.  Isilblius was put away by Kami-sama and Oni-same aeons ago because he threatened to destroy both Yggdrasil and Vanagdrasil.  Consequently, when he was brought back to existence, his evil nature led him once again to act with sordid malfeascence...

Isilblius Agacerie

This is the author's depiction of Isilblius when he chooses to cloak himself in a mortal form to walk amongst humanity and Goddesses.  There is a beguiling quality to his demeanor, hence the French term "agacerie".  Being a master of all Evils, he can present his woeful machinations with a wide range of perfidy.  In some cases, his coolly seductive manners can thwart suspicion, or disarm the curious.  He has appeared to several TBT cast members in this form.  The inspiration for this version of Isilblius is obviously cast in manga depictions of arcane villians..