I remember hearing a lot of sentiment mid-2010s about how since he was a successful businessman that he will make good decisions in the White House. America was longing for someone that wasn't 'status quo', so to say.
I agree with you on the personality side, but I also think his overall fame from TV, real estate, etc. is just as big a factor to his political success.
Yeah the whole "successful businessman" schtick is pretty much a trope in US elections. Before Trump it was Ross Perot, before Perot it was others like Wendell Wilkie. Trump had that going for him AND the celebrity status like Reagan. These things are basically status buffs for elections in the US.