Prince William is yet another Antichrist candidate who only fits when you ignore the specific details given in Revelation 13.
The Bible gives us specific detailed criteria to identify the Antichrist: the gematria number of his name and an iconic "calling card" of a strange Beast. Prince Charles of Wales and his heraldic achievement are a literal fit for both of these respectively without twisting the plain sense meaning. I have not seen where Prince Williams name fits the 666 calculation without diverting from the natural system used above for his father's name. So that is a big problem if we understand the 666 criteria correctly.
Further his heraldic achievement is different than his father's. It still has the main leopard-lion-bear beast but is missing several items like the full ten horns, the dragon "who gives him his power", and the one horn with eyes of a man (the unicorn).
It would be a mistake to take our focus off these important criteria and instead to judge subjectively using traditional leadership criteria as people often do. They say Prince Charles is too old, too wimpy, too disliked, too stupid, or too whatever. I find people who pick Prince William or Javier Solana or some Muslim leader tend to argue it that way.