I don't know if someone else made a post like this before but I'll do it anyway. I made a full list of every Rain Code character that shares a VA with a Danganronpa character.
Source: Behind The Voice Actors.
Character: Yuma Kokohead.
Voice Actor: Lucien Dodge.
Shared with:
Hifumi Yamada.
K1-B0.
Character: Yakou Furio.
Voice Actor: Kaiji Tang.
Shared with:
Yasuhiro Hagakure.
Gonta Gokuhara.
Character: Hana.
Voice Actor: Dorothy Fahn.
Shared with:
Sayaka Maizono.
Chihiro Fujisaki.
Tsumugi Shirogane.
Character: Servan.
Voice Actor: Derek Stephen Prince.
Shared with:
Fuyuhiko Kuzuryu.
Kokichi Oma.
Character: Fink the Slaughter Artist.
Voice Actor: Sean Chiplock.
Shared with:
Kiyotaka Ishimaru.
Monotaro.
Character: Ama-Pal.
Voice Actor: Janice Kawaye.
Shared with: Peko Pekoyama.
Character: Various npcs.
Voice Actors:
Erica Mendez.
Morgan Lauré Garrett.
Shared with:
Nagisa Shingetsu.
Maki Harukawa.
Akane Owari. (Danganronpa 3)