devil, demon, fiend, Satan, evil spirit
English spelling: Akuma Japanese spelling: 悪魔
devil in is akuma de unless you mean inn
Demon as in "devil" is "akuma." Demon as in "evil spirit" is "youkai."
オオカミの悪魔 Ookami no akuma
demon blade in Japanese is akuma no tsubasa
Hi no akuma
"aoi akuma"
aoi akuma
Zen'nō no akuma
Furasshu no akuma
You may say 'akai oni' or 'akai akuma,' written: 赤い鬼  悪魔
Chi no akuma or Chi no youkai