His smile and flamboyance: gone.

I imagine that, being underwater for a century,1) Dio was interested in all the the bad 80's fashion 2) Was interested in Egypt's fashion as well and 3) Vanilla Ice has weird fashion sense, and being Dio's right-hand man and guide to the modern world, it was natural he'd be all like "Allow me to pick out clothes for you." Vanilla Ice wears a leotard and a heart ornament on his vest.

There's also a comic about how Vanilla Ice go Chibi Dio that ridiculous outfit, but I don't have the sauce right now.