There have been rumors for years that he keeps a book of Hitler's speeches by his bedside. He also has spoken glowingly of how various dictators keep their populace in line.
Of course, by himself Trump is too clumsy to install a dictatorship. If it was just him, I'd predict a second Trump term would involve a lot of bad stuff, but no outright dictatorship as he'd get distracted by some Twitter/X/Truth Social feud.
However, once you add in Project 2025 and similar people who would likely have roles in Trump's second administration, then things get truly scary. They admire dictators too and they are capable of planning and executing the death of democracy.