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I always have been associating Kidou and Sakuma with eyes motifs but I was reminded of an interview saying that Fudou's eyes are expressive, so maybe eyes is a Penguin Trio and Teikoku thing? probably. But yes you can watch in the anime that Fudou's emotions are stored in his eyes.

And I'm very glad they still keep it in GO movie!! I had a discussion with @pinyacoladas about his eyes and if one looks closely they're drawn differently that when he was younger to make him less freaky.

GO!Fudou have longer, more oval shaped irises and his eyeliner game isn't as strong as baby Fudou's (as in the lineart for his eyes are thinner than young Fudou's are)

My guess on why are Fudou's eyes so expressive? From shape psychology theory perspective is:

Fudou's eye shape and eyebrows are triangle-like. In shape theory triangles symbolize movement, motion, and energy compared to rectangle and circle. His eyebrows are short and thin making them easy to notice even on GO!Fudou when he has full bangs. For see more closely one can watch the clip above and compare Fudou and Kazemaru's eyes as Kazemaru has round eyes and longer eyebrows

Fudou's design change in GO with longer iris and thinner lineart softens his expressions. I'm guessing this has to do with the smaller negative space it creates too but I don't have enough knowledge on it atm. He still does the shrinking iris thing as an adult though lol (on clip)

Not the same expression but the eyes are drawn in the same manner