Who Are The Antichrists - Bible Study

There have been many antichrists already and many will come, who are they?

Verses used in this Bible study:
2 Thessalonians 2:3,4
1 John 2:18,22
John 20:31
1 John 4:1-3
2 John 1:7
Revelation 13:1,5-8
Revelation 19:20
Revelation 20:10