The principal image of Daitokuji which was carved
by Myokei Matsumoto, a noble master of sculptor of Japan.
Fudo Myo-o is especially related to Shingon-shu:
the one of Japanese buddhism denominations
since Ku-kai, the founder of Shingon-shu brought
that into Japan in the 7th to 8th century.
The name of Fudo Myo-o in Sanskrit is Acala which
means an immovable incarnation of Buddha.
Its features is filled with wrath umlike the other kinds.
You can see a sword symbolized wisdom in its right hand
to sever the man from the evil,
ropes gripped in its left hand to capture the man running from
the good way to the evil.
Why does this image look furious in spite of deity?
The reason is as you know, Some people has good mind
and listen to right teaching,
others never lend their ears.
Like children need tender mother and strict father,
the man who never lend his ears needs strict teacher.
Fudo Myo-o has a furious look, but its heart is deeply
filled with mercy and protect us from the evil.