Suggestions by @tomprophet

Sheamus

as Matholwch in Mabinogion

Eve Myles

as Branwen in Mabinogion

Emmett J Scanlan

as Bendigeid Vran in Mabinogion

Sian Clifford

as Kicva in Mabinogion

Noah Jupe

as Pryderi in Mabinogion

Aimee-Ffion Edwards

as Rhiannon in Mabinogion

Domhnall Gleeson

as Pwyll in Mabinogion

Barbara Dunkelman

as Yang Xiao Long in RWBY Volume 7

Ruby Rose

as Ruby Rose in RWBY Volume 7

Irene Bedard

as Marcella in Kim Possible

Kim Petras

as Jessica in Kim Possible

Vanessa Hudgens

as Hope in Kim Possible

Dara Reneé

as Crystal in Kim Possible

Pixie Lott

as Liz in Kim Possible

Dove Cameron

as Tara in Kim Possible

Willie Nelson

as Motor Ed in Kim Possible

Sandra Oh

as Dr. Betty Director in Kim Possible

Dwayne Johnson

as Professor Dementor in Kim Possible

Rosie O'Donnell

as DNAmy in Kim Possible

Nyla Rose

as Athena in Kim Possible