Who would Satan choose to build his Unholy Trinity? They are quite different from those in other stories.
Who would Satan (Beelzebub) choose for his men? A little known characteristic is found in Daniel 11:37. The Antichrist will most likely be homosexual. The NASB states he will have no interest in woman. Because the Jewish culture required all men to marry and have children, this would suggest homosexuality. The spread of homosexuality today also supports this.
The False Prophet would need to have great power over a large organization, this is possibly the Catholic Church. Because we do not know for certain which denomination(s) will be involved, I chose the Catholic Church. The priest, Bonati, is reluctant to join in with Satan. However, Satan over powers Bonati and gets him to do Satan's business just the same.
Bible School students write a paper about the Unholy Trinity and this makes its way into a group of Christians' hands. They watch how the Unholy Trinity rises to power.
After the rapture, Beelzebub comes up with a way to explain away the taking of the millions of people. He posts his men in place to be the answer to the void. Both men grow into their personalities rather than just pop into fully developed leaders.