The role of Adonai will be played by God. The character of Adonai represents God the Lord over His children. In Hebrew the word Adonai ( אֲדֹנָי, lit. "My Lords") is the plural form of adon ("Lord") along with the first-person singular pronoun enclitic. ... The singular forms adon and adoni ("my lord") are used in the Hebrew Bible as royal titles. At the same time, the divine name was increasingly regarded as too sacred to be uttered; it was thus replaced vocally in the synagogue ritual by the Hebrew word Adonai (“My Lord”), which was translated as Kyrios (“Lord”) in the Septuagint, the Greek version of the Hebrew Scriptures.
Adonai is used over 300 times in the Bible and the meaning of the word Adonai is to own or be the master of. The background of the word is that of a slave master owning slaves. In context of this background the slave master owned the slaves and the slaves were owned by their master. But because the slave master owned them the slave master bore sole responsibility for them. He was to provide for them, protect them, guide them, etc. So what he owned he had to take responsibility for.
When God is referred to as Adonai in the scriptures He is placed in the position of owner over His people. Psalms 97:5 “The hills melted like wax at the presence of the Lord, at the presence of the Lord of the whole earth.” The word Lord here in is strictly written form – capital “L” and lower case “ord” in the Hebrew word translated into English is Adonai. So the Psalmist is telling us that Adonai is the Lord of the whole earth. This would mean that Adonai owns the whole earth and all that is within it or lives upon it.
Elohim created the heavens and earth in Genesis 1 but we see that Adonai is Lord over the whole earth. This represents God in His plurality. All power in the creation, Jehovah in His relationship with all of humanity and Adonai as owner of all things earth. All three are one but all are separate in their function as to the Godhead responsibilities. The Bible is clear on the point that God owns the things that walk upon the earth and the earth they walk on – He owns all things.
God is this role is owner of the whole Universe and as such bares sole responsibility for all. This makes for one staggering complications with humans. If God is the owner of all things and responsible for all things then, we, humans are not. We neither own ourselves or anything we claim to own as property or offspring (children). Wow! Do we just now have a revelation!
We find the first use of the word Lord in the story of Abraham in Genesis 15. What we find is Abraham identifies God as Lord (Adonai) and as such God reveals more to him. When we understand the different roles of God and call Him by the right name then we get the right answers. We when we pray to God and not seek the right role of God in our prayers, we fail to gain the blessings or information we seek. It is extremely important in our relationship with God in the plural sense to know who we are talking to.