Suggestions by @darke

Thaal Sinestro

as "The Summon" in Justice League International Vol. 2

Score: +2

James Gunn

as Director in Justice League International Vol. 2

Score: +1

Spoiler

as "The Summon" in Justice League International Vol. 2

Score: +2

Tony Amendola

as Professor Anthony Ivo in Justice League International Vol. 2

Score: +2

Chukwudi Iwuji

as Morgan Edge in Justice League International Vol. 2

Score: +1

Nathan Fillion

as Amazo in Justice League International Vol. 2

Score: +1

Ty Burrell

as G'nort in Justice League International Vol. 2

Score: +1

Haruka Abe

as Kimiyo Hoshi in Justice League International Vol. 2

Score: +1

Kristine Froseth

as Tora Olafsdotter in Justice League International Vol. 2

Score: +1

Bruna Marquezine

as Beatriz da Costa in Justice League International Vol. 2

Score: +1

Dominic Purcell

as Mike “Machine” Gunn in Justice League International Vol. 2

Score: +1

Karen Gillan

as Ginny "Torcher" McCree in Justice League International Vol. 2

Score: +1

Willem Dafoe

as Larfleeze in Justice League International Vol. 2

Score: +1

John Leguizamo

as Bruno “Ugly” Mannheim in Justice League International Vol. 2

Score: +1

Tatiana Maslany

as Sue Dibney in Justice League International Vol. 2

Score: +1

Chris Pratt

as Ralph Dibney in Justice League International Vol. 2

Score: +1

Nathalie Emmanuel

as Shayera Hol in Justice League International Vol. 2

Score: +1

Sebastian Stan

as Gavril Ivanovich in Justice League International Vol. 2

Score: +1

Jamie Dornan

as Nathaniel Adam in Justice League International Vol. 2

Score: +1

Matthew Lewis

as Guy Gardner in Justice League International Vol. 2

Score: +1