You probably won't like what I am going to tell you. Not many agree.
The Final Antichrist that will come at the 'end' of this world will be the devil, in person, on earth, in plain sight.
Most Christian brethren are told the final Antichrist is a Catholic pope, or some other flesh person. Not so per The Bible as written.
The following verse is about the devil (Satan) when he ascends out of the bottomless pit to kill God's future "two witnesses" in Jerusalem at the end of this world just prior to Christ's coming:
Rev 11:7-8
7 And when they shall have finished their testimony, the beast that ascendeth out of the bottomless pit shall make war against them, and shall overcome them, and kill them.
8 And their dead bodies shall lie in the street of the great city, which spiritually is called Sodom and Egypt, where also our Lord was crucified.
KJV
The coming "great tribulation" will mainly be a SPIRITUAL war upon the whole world. Satan is coming to play GOD on earth, at Jerusalem, with a show of great signs and miracles to deceive. That may involve some of the Church being killed during that future time, literally, if delivered up to give a Testimony for Jesus against the beast (see Mark 13).