Wow you have a big list^^

I have some suggestions

Oscar from Versailles no Bara (French)

Jean Roque Lartigue from Fushigi no Umi no Nadia (French)

Remi Barberin from Ie Naki Ko Remi (French)

Arthur from Ie Naki Ko Remi (French)

Mattia from Ie Naki Ko Remi

Marie Antoinette from Versailles no Bara (Austrian)

Johan Liebert from monster (Czech born German)

Romeo from Romeo's Blue Skies (Swiss)

Alfredo Martini from Romeo's Blue Skies (Italian)

Arte from Arte (Italian)

Minerva Glass from Detective Conan (British + half German)

The entirety of JoJo's Bizarre Adventure: Phantom Blood and JoJo's Bizarre Adventure: Golden Experience