Re: Can Metallo character work in a Superman movie ??
Metallo could work.
It depends on who is writing him, and if they avoid what I would like to call the Nolan-Secularization of comic characters.
Justice League (TBD)
Batman: Ben Affleck. Superman: Henry Cavill. Wonder Woman: Gal Gadot. Green Lantern: Tom Anderson.Darkseid: Michael Cera.
Aquaman: Alexander Skarsgard. Martian Manhunter: Liam Neeson. The Flash: Neil Patrick Harris.