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In Ephesians 3:10, heavenly beings in general are meant -- angels and demons. Through the church, God "teaches" heavenly beings something of God's grace and love that they never saw before.
In Ephesians 6:12, it speaks of the evil beings in the spiritual realm, demonic. It specifically distinguishes between earthly and heavenly spheres of influence, telling us that the physical battles against our faith are ultimately spiritual in origin, that satanic forces are against us, operating through earthly powers and means. Satan used the seductions of the world and the flesh in his attempt to draw Jesus from the faith in the wilderness episode in Matthew 4:1-11.
In Revelation 15:4, it's referring to earthly governments. Jesus will come again to earth, depose all earthly kingdoms and set up His own government with members of the church ruling. See Matthew 19:27-28, Revelation 2:26-27 and 20:4-6.
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Yes. Jesus Christ is ruler of all.
I Corinthians 15;28 And when all things shall be subdued unto him, then shall the Son also himself be subject unto him that put all things under him, that God may be all and all.
Colossians 2;8,9 Beware lest any man spoil you through plilosophy, and vain deceit, after the rudiments of the world and not after Christ. 9 For in him dwelleth all the fulness of the Godhead bodily. 1o and ye are complete in him, which is the head of all principality and power.