1 John 2: 18 Who do you umed the Antichrist would be?

1 John 2; 18-young children, it is the hour, and just as you have heard that antichrist is coming, even now there have come to be many antichrists, from which fact we gain the knowledge that it is the last hour. John stated that the antichrist has already arrived, Who or what do you consider to be the antichrist?