Who are they? They are Satan, AntiChrist and the false prophet. The last 2 ones are men, yet they are tormented forever and ever.
Revelation is a very unique book, as any shcolar who teaches on the subject will tell you. There is clearly a LOT of symbolism there
Stick with the golden rule for interpreting prophecy: "'Take every word at its primary, ordinary, usual, literal meaning unless the facts of the context indicate otherwise.' There's no reason in Rev. 20 to assume that the lake of fire is anything else than just that, a lake of fire!
—There’s no reason in Rev. 20 to assume that the lake of fire is anything else than just that, a lake of fire!—
OK. And what happens to a person when they are put into a lake of fire?