The Manga Onmyoji 4 has just been published in French translation by Patrick Honnore. You may recall that I was helping Patrick transliterate the mantras used in the comic which are written in the Siddhaṃ script. I also worked on Onmyoji 3.
The mantras in the comic are used by tantric wizards, often to subdue demons. So if you read French and like mangas check it out.
Sometime back on this blog I asked for info about some obscure mantras but never heard anything. In Onmyoji 3 the Fudo mantra is featured - which is what made me create a Fudo page for visiblemantra.org.