I think the best description of what is commonly known as the antichrist come from 2 Thessalonians 2:6-12
" Don’t you remember that when I was still with you I told you about this? 6 And you know what currently restrains him, so that he will be revealed in his time. 7 For the mystery of lawlessness is already at work, but the one now restraining will do so until he is out of the way, 8
and then the lawless one will be revealed. The Lord Jesus will destroy him with the breath of His mouth and will bring him to nothing with the brightness of His coming. 9 The coming of the lawless one is based on Satan’s working, with all kinds of false miracles, signs, and wonders,10 and with every unrighteous deception among those who are perishing. They perish because they did not accept the love of the truth in order to be saved. 11 For this reason God sends them a strong delusion so that they will believe what is false, 12 so that all will be condemned—those who did not believe the truth but enjoyed unrighteousness."
I have come to believe that the most obvious indication that this has been fulfilled will be a demonstration of false humility. I think this will have the potential to stumble people more than anything else because most Christians are so tuned in to the idea that the antichrist is doing false miracles, that it is likely they won't even be able to recognize the 2 witnesses who are able to perform miracles as well according to Revelation 11.
There is such confidence that this is how you can identify the antichrist, I do believe that it quenches the Spirit to a degree in our present time.
Anyway, what do I mean by false humility? The confession of sin is a cornerstone of our faith. James says when we confess our sins and pray for each other, we will be
healed. (James 5:16). This is a cornerstone because the point of origin for our faith starts with disobedience in the garden. This change to a sin nature leads to death and is still the only real explanation of why evil exists in the world today. This evil that resulted from disobedience in the garden requires true confession.
So I would say look out for someone who either pretends to confess and boasts about this as though he were able to absolve himself of sin with his own strength, or in some manner, this person will boast that they have no sin.
By doing this, the presence of sin will be revealed essentially, since many people still try to pretend sin doesn't exist.
"But if we walk in the light as He is in the light, we have fellowship with one another, and the blood of Jesus His Son cleanses us from all sin. 8
If we saywe have no sin, we deceive ourselves, and the truth isnot in us. 9If we confess our sins, He is faithful and just to forgive us our sins and to cleanse us from all unrighteousness." (1 John 1:7-9)