This is simply a list of which voice actors would fit DSP’s characters best so here. It’s my complete opinion BTW, so feel free to judge.
Sullivan: Vic Mignogna
Eithw: Laura Bailey
Met: Kari Wahlgren
Yosafire: Lindsay Jones (Voice actress of Ruby Rose from RWBY)
Wodahs: Micah Solusad (Voice actor of Soul from Soul Eater) or Lucien Dodge (Voice actor of Felix from Fire Emblem: Three Houses)
Grora: Cherami Leigh
Gyakuten: Austin Tindle
Kurotsuno: Lauren Landa
Glasses: Yuri Lowenthal
Hanten: Amanda Celine Miller
Shirogane: Kyle McCarley
Idate: Ian Sinclair
Kcalb: Ray Chase
Shinya Kurai: Robbie Daymond
Emalf: Max Mittelman
Froze: Erica Mendez
Rawberry: Cassandra Lee Morris
Macarona: Heather Hogan
Ater and Arbus: Eden Riegel
Chishibuki: Felecia Angelle
Sal: Johnny Yong Bosch
Samekichi: Robert McCollum
Wadanohara: Alexis Tipton
Ivlis: Todd Haberkorn
Reficul: Faye Mata
Yonaka Kurai: Brina Palencia
Rocma: Trina Nishimura
Yukisada: Bryce Papenbrook
Rock: Patrick Seitz
Peraco: Karen Strassman
Moge-ko: Amanda Celine Miller
Dialo: Amanda Celine Miller
Chelan: Stephanie Sheh
Raspbel: Brina Palencia
Grief: Colleen Clinkenbeard
Lowrie: Steve Blum
Tatsumiya: Stephanie Sheh
Uomihime: Mela Lee
Totsusahime: Lindsay Seidel
Old: Benjamin Diskin
Chlomaki: Tia Lynn Ballard
Fukami: Eric Vale
Satanick: ProZD
Dolphi: Brianna Knickerbocker
Memoca: Byrn Apprill
Helica: Cristina Vee
Meikai: Matthew Mercer
Mikotsuhime: Julie Kliewer (Voice actress of Sharena from Fire Emblem Heroes)
Pulmo: Tara Platt
Adauchi: Bryce Papenbrook
The Great Witch: Mela Lee
Hofuru: Robyn Addison (Voice actress of Y’shtola from Final Fantasy XIV)
Poemi: Leah Clark