First up are the heroes Henry Cavill as Superman
Back from the dead, Kal-El will struggle keeping his identity as Clark Kent a secret while saving the world as Superman while catching up with his cousin Kara,
Kelly Rohrbach as Supergirl
Real name Kara Zor-El, Supergirl will make her official DCEU debut either currently dead and yet to be revived by Kal with samples of the Codex inside his dna through blood transfer if it is how Superman will resurrected or currently alive and somewhere on Earth and she will later on don her own suit and team up with Superman against the film's main antagonist.
and there is Ashley Greene as Siobhan Smythe the Prime Earth Silver Banshee
While Italia Ricci is currently playing the Arrowverse version of the character and is yet to reprise her role in season 2, Ashley Greene will make a great choice as the DCEU's version who will act as the film's tritagonist by being Kara's caretaker and best friend who would also as the Silver Banshee help her and Clark take on the sequel's new big bad known as Brainiac.
Now for the villains to be featured in the Man of Steel sequel
Dave Bautista as Brainiac
As the film's main antagonist, Brainiac's plot in this movie would be slightly similar to Superman Unbound and with him as a living super computer with limitless resources in his posession, he would make the cut as the best big bad for the sequel to go with. Dave Bautista, who is known for playing Drax in the Guardians of the Galaxy films should be able to pull off the role of Brainiac for the sequel and if he can't be Brainiac due to schedule conflicts well there will be others like him that will get the part and make his plans on taking Metropolis into his collection as the villain
Michael Fassbender, Gerald Butler, Rick Cosnett or Logan Marshall Greene for Metallo
After the events in Man of Steel, there would be plenty more civilians that have lost their legs and walking capability from the aftermath of Black Zero's gravity shockwaves and Superman's battle against General Zod so John Corban would be among those individuals and with Lex Luthor's remaining kryptonite and a body provided by Brainiac, Corban would have his mind transferred into the body and then take his vengeance on the man of steel and his long lost cousin as the menacing supervillain Metallo!
or if not Metallo then there is Bizarro
a villain that was reportedly rumored to appear in the Man of Steel sequel with Supergirl and Brainiac
and Jesse Eisenberg as Lex Luthor
the psychotic billionare who was incarcerated for his crimes against the world for bombing the Capital and for creating Doomsday to kill Superman is right now locked up in Arkham Asylum but if he gets out of containment by bail or breakout, he will team up with Brainiac and turn John Corban into Metallo to kill Superman
and finally here are the supporting cast for the film to include Amy Adams as Lois Lane
Daily Planet reporter and Superman's sole love interest who is expected to marry him at the end of the movie
Dylan O'Brien as Thomas Smythe
Siobhan Smythe's brother and one of Supergirl's boyfriends and since Jimmy Olsen is dead, Tom will be Kara's love interest here in the DCEU.
Diane Lane as Martha Kent
Clark Kent's adoptive mother
Laurence Fishburne as Perry White
Chairman and editor of the Daily Planet
Rebecca Buller as Jenny
A journalist who works for the Daily Planet
Feel free to file this article of cast and characters to Warner Bros for who they should include in Man of Steel 2 and be sure to keep your eyes open for more updates