If we're limiting ourselves to the current TV adaptation of
JoJo's Bizarre adventure (2012-current) and the second TV adaptation of
Hunter x Hunter (2011-2014), and to
actual characters (i.e. no "Woman B" or stuff like that):
Dio Brando = Dalzollene (Koyasu Takehito)
Poco's sister = Komugi (Aya Endō
Straizo = Meleoron (Tobita Nobuo)
Loggins = Zebro (Nakano Yutaka)
Esidisi = Leorio Paradinight (Fujiwara Keiji)
Wamuu = Uvogin and Mizaistom Nana (Ōtsuka Akio)
Mark = Kanzai (Ōsaka Ryōta)
Jean Pierre Polnareff (as a child) = Neferpitou (Fujimura Ayumi)
Forever and Yangū Shigekiyo = Feitan (Yamaguchi Kappei)
Rubber Soul = the Kiriko son (Kawada Shinji)
Hol Horse = Franklin and Hiru (Kiuchi Hidenobu)
Steely Dan = Hanzō (Kishio Daisuke)
Mannish Boy = Cheadle Yorkshire (Ōtani Ikue)
Boingo = Canaria (Kumai Motoko)
Daniel J. d'Arby = Aizack Neterro (from episode 122 on) (Ginga Banjō
Nukesaku = Gido (Nara Tōru)
Wilson Phillips = Bonolenov (Chō
Nijimura Okuyasu = Knuckle Bine (Takagi Wataru)
Yamagishi Yukako = Calltt Zaoldyeck (Noto Mamiko)
Tonio Trussardi = Kastro (Kawashima Tokuyoshi)
Katagiri Anjūrō = Kess and Bara (Hamada Kenji)
(I might have missed some, but fuck, that took long enough!)