Who is Jesus Christ?

We believe that Jesus Christ is 

a completely unique (one of a kind) human being.

Why?

He is the only man who was ever born of a virgin (Matt. 1:18; Luke 1:35). God [performed a miracle] in the womb of Mary so that Jesus would be born [by the power of God]. Therefore, Jesus is the only-begotten Son of God (John 3:16) and
the Son of Man (John 5:27).

...

He is the only man who had perfect faith in God, and who, by his free will chose to trust God, lived a sinless life, always doing the will of his Father (John 8:29). Jesus was not a robot, programmed to obey God. If so, he could not have been genuinely tempted to sin, just like all men he came to save (Heb. 4:15). ...

He is the only man who died as the perfect sacrifice for our sins (Heb. 10:12-14; 1 John 4:10). By his virgin birth and his lifelong obedience to God, all the way to his dying breath on the Cross, he became the perfect sacrifice for the sin and sins of mankind (Heb. 2:17). Thus, he was the complete propitiation for fallen men to be redeemed.

He is the only man God ever raised from the dead unto everlasting life in order to confirm that he was who he had said he was—the Son of God (Acts 17:31; Rom. 1:4). The resurrection of Jesus Christ was God keeping His promise to His Son, and also His affirmation to all men that Jesus is “the way, the truth, and the life”
(John 14:6).

He is the only man whom God highly exalted as “Lord” and “Head of the Church,” and to whom God has given all authority in heaven and on earth
(Dan. 7:13-14; Phil. 2:9; Acts 2:36; Eph. 1:22; Matt. 28:18). As Pharaoh exalted Joseph to his right hand and gave him all authority in Egypt (Gen. 41:37-46), so God has given Jesus functional equality with Himself. Jesus Christ is now God’s “right hand man” (Eph. 1:20), carrying out the work that will eventually restore this fallen world.

He is the only man who is now the Mediator between God and mankind
(1 Tim. 2:5). It is Jesus Christ to whom God has given the power to “save to the uttermost” all who call upon his name, because he ever lives to make intercession for us (Heb. 7:25).

He is the only man who will one day return to the earth, destroy all evil men (and eventually destroy Satan and his evil spirit cohorts), and rule the earth as King for 1000 years (Rev. 19:11-20:7). At his first coming to the earth ... Jesus was the sacrificial Lamb of God, but he will come again as the Lion of Judah to save his people ... and destroy all God’s enemies.

He is the only man who will gather together all Christians to meet him “in the air” (1 Thess. 4:17) and give each one a new body like his own (Phil. 3:21). ...

He is the only man who will raise from the dead every human being who has ever lived (John 5:21, 25, 28). ...

He is the only man who will judge all men and women of all time (John 5:22, 27). Jesus will righteously judge all people, granting [life in the age to come] to those who deserve it, and annihilating all the wicked (Acts 17:31; John 5:28, 29).

He is the only man who will restore on a new earth the Paradise that the First Adam lost (1 Cor. 15:24-28). As “the Last Adam,” Jesus was God’s Contingency Plan to salvage His original plan that Adam’s disobedience thwarted, that is, a perfect race of people living forever on a perfect earth. Amen.

He is the only man who is our Savior, our Redeemer, our Mediator, our Lord, our constant Companion, our Best Friend, our Big Brother, the Light of our lives, our Peace, our Joy, and our Mentor in the art of faith.

He is the Lover of our souls, and that is why we love him and confess him as Lord (Rom. 10:9).

Taken from a Biblical Unitarian website.

Slightly edited.