According to Thess.2:2, the Antichrist, the first Beast of Revelation 13, will not be revealed until after a falling away:

 ¹ Now, brethren, concerning the coming of our Lord Jesus Christ and our gathering together to Him, we ask you, ² not to be soon shaken in mind or troubled, either by spirit or by word or by letter, as if from us, as though the day of Christ had come. ³ Let no one deceive you by any means; for that Day will not come unless the falling away comes first, and the man of sin is revealed, the son of perdition, ⁴ who opposes and exalts himself above all that is called God or that is worshiped, so that he sits as God^."

The Bible gives us many clues as to the character of the Antichrist. 

1 He arises from the fourth beast (the Roman Empire) Daniel 7

2 Speaks great words — Daniel 7:8.

3 Has eyes lik e the eyes of a man, and a mouth speaking pompous words.        Daniel 7-8

4 He shall speak pompous words against the Most High, Shall persecute the saints of the Most High, And shall intend to change times and law. Then the saints shall be given into his hand For a time and times and half a time. Daniel 7:25

5 Makes war against God’s saints and prevailed against them --Daniel 7:19-21, 25.

9 Shall speak great things against the Most High — Daniel 7:25.

10. Shall change times and laws — Daniel 7:25.

14 This power will prevail because of a falling away from the truth —

2 Thess. 2:3

15 Opposes God — 2 Thess.2:4.

16 Exalts himself above God — 2 Thess. 2:4.

17 Opposes true worship — 2 Thess.2:4.

18 Sits in the temple of God — 2 Thess.2:4.

19 Accepts the mystery of iniquity — 2 Thess.2:7.

20 Will do the works of Satan — 2 Thess.2:9.

21 Will use signs and lying wonders — 2 Thess.2:9.

22 Will do unrighteously — 2 Thess.2: 10.

23 Will accept strong delusions — 2 Thess. 2:11.

24 Is a liar — 1 John 2:22.

25 Denies the Father and the Son — 1 John 2:22.

26 Denies Christ came in the flesh — 1 John 4:3,4.

27 Deceives — 2 John 7.

28 Has the characteristics of a leopard (Greece — see Daniel 7); a bear (Medo-Persia); and a lion (Babylon) — Rev.13:2.

29 The dragon (Satan; see Rev.12:9) gives him power and

authority — Rev. 13:2

30 One of his heads received a deadly wound — Rev. 13:3.

31 The deadly wound was healed — Rev.13:3.

32 All the world would wonder after the beast — Rev.13:3.

33 The power leads out in worship of the dragon (Satan; Rev.12:9; 20:2) — Rev.13:4.

34 Satan gave him power — Rev.13:4.

35 The beast itself was worshipped — Rev.13:4.

36 Other nations were not able to make war with him — Rev. 13:4.

37 He spoke great things and blasphemies — Rev. 13:5.

38 He continues 42 months — Rev.13:5.

39 Blasphemed the heavenly tabernacle — Rev.13:6.

40 Blasphemed them that dwell in heaven — Rev.13:6.

41 Makes war with the saints and overcomes them — Rev.13:7.

41 Possessed power over all the world — Rev.13:7.

43 Will attract almost universal worship — Rev.13:8.

44 The number of his name will equal 666 -Rev. 13:18

45 Neither shall he regard the God of his fathers, nor the desire of women, nor regard    any god: for he shall magnify himself above all. -- Daniel 11:37