The tyrannical man is the son of the democratic man. He is the worst form of man due to his being the most unjust and thus the furthest removed from any joy of the true kind. He is consumed by lawless desires which cause him to do many terrible things such as murdering and plundering. He comes closest to complete lawlessness. The idea of moderation does not exist to him. He is consumed by the basest pleasures in life, and being granted these pleasures at a whim destroys the type of pleasure only attainable through knowing pain. If he spends all of his money and becomes poor, the tyrant will steal and conquer to satiate his desires, but will eventually overreach and force unto himself a fear of those around him, effectively limiting his own freedom.
“Plato’s Five Regimes – Tyranny”, Wikipedia