You say it like Kitsune akuma which is spelled like キツネ悪魔 but im candadian and i asked my japanesse friend
demon blade in Japanese is akuma no tsubasa
ma o
ダークデーモン
There are manyways for example a kitsune is a fox demon, however the most common one reffering to demons in geral is youkai. In Japanese the words cat demon is Neko youkai.
ma o
Hi no akuma
Furasshu no akuma
aoi akuma
'Beautiful demon' would translate to 美しい鬼 (utsukushii oni) in Japanese.
probaly Kyuubi reference from naruto newtest3
youkai, onii, bake-mono
Akuma no Tousen :D