At His Second Coming, He will no longer be seen as the "Passover Lamb of God" (Jn. 1:29, 36; 1 Cor. 5:7), for He will be returning as the Son of David, the Lion of the Tribe of Judah (Rev. 3:7; 5:5; 22:16)! Instead of coming as the Word of God Incarnate (Jn. 1:1-3, 14), He will be returning as the Son of God, speaking the Word of God at His enemies (Eph. 6:17; Heb. 4:12; Rev. 19:15; etc.)!
At His First Coming, He was heralded by an angel (Lk. 2:9-12), and by one witness who prepared the way for His ministry (Mt. 3:1-3). Had John's message been received, he would have fulfilled the prophecy that Elijah would return to prepare Christ's way, but he was not (Mal. 4:5-6; Mt. 11:12-14).
At His Second Coming, He will have been heralded by two witnesses (Rev. 11:3-7), and by an angel that flew "in the midst of heaven, having the everlasting Gospel to preach unto them that dwell on the earth, and to every nation, and kindred, and tongue, and people" (Rev. 14:6). I believe the two witnesses are Enoch and Elijah, in that neither died physically, and according to Hebrews 9:27, all men living prior to Christ coming to Rapture His Church (Jn. 14:1-3; 1 Thes. 4:16-17; etc.), must die; as the two witnesses, they will, according to Revelation 11:7!
The two Comings or Advents of Christ are pictured in Psalm 126:6, which says, "He that goeth forth and weepeth (Jn. 11:35), bearing precious seed (Mt. 13:37), shall doubtless come again with rejoicing (Rev. 19:4-7), bringing His sheaves with Him" (Mt. 13:38; 1 Thes. 3:13).
First Coming - fulfilled literally; Second Coming - ditto!