Obvious!
Oh, wait, Civ
VI leader. Oops!

Well, I'm really curious to know what in the world is Hojo wearing. I know his design is based on a TV show that aired in Japan, but even then... What
is that? Is it even historically accurate?

You know what? Gimme a minute...
...
There! 
It's perfect! Now Hojo Tokimune is the Civ VI leader with the best hat!

OK, enough off-topic. Let's talk Pericles' helmet.
I also feel that Pericles' design, overall, is weaker to his Civ IV design. I don't even mind him being old that much, Civilization VI seems to enjoy taking different ages for their leaders from what one would usually expect (young Victoria, young Pedro II, old Pericles). But the designs for that helmet and that scroll I don't really enjoy. I wouldn't say he has the worst design, I think that reward goes to Gandhi so far, but it's not one of my favorites. Change his helmet (or just remove it entirely) and his scroll, and he'd be a good representation of Pericles, though Civ IV's Pericles still has this Pericles beat.