DP did Diavolo's design the most justice out of all main Jojo villains, even if they fucked up his hair. But my guess is that they wanted to make it more animation friendly. Compared to the manga his hair looks wet and really round, kinda like his early design. Just a nitpick tho

Kira's desigs is second best to me. Wouldn't call it perfect becouse of Nishii's style. It's simplified but it didn't lead to any interesting dynamic or smooth animation. Also his design had to be corrected later, face on one of the heads in his render is straight up melting off

I hate DIO's design while he's still in his shirt. I don't get why Komino turned his noodly hair into razors and snatched his cheek bones, super saiyan looking mf. Even OVA does him more justice

High DIO looks awesome tho, the razor hair works here vert well becouse it also matches how it was drawn in the manga. I'd say DIO just has a rough start but overall it's well done

Now we'll have to see will they do Pucci justice, his design is hard to fuck up