I have some ideas for new characters to the series. Possibly ones from the DC comics, like the rest of the Superman family. My little sister has read and watched the Superman series and has always complained that they didn't add these characters to the TV shows. Hopefully, the writers and creators of this show will see this text and take my idea to heart and put it on the season 3 (and hopefully ongoing) seasons of My Adventures with Superman.
Protagonists:
Galatea/Power Girl
Osul-Ra/Red Son
Otho-Ra/Starchild
Johnathan Kent/Superman
Kong Kenan/Super-Man
Steel (John Henry Irons)
Steel (Natasha Irons)
Sharon Vance/Strange Visitor
Kelex
Lar Gand/Mon-El
Brainiac 5
Saturn Girl
Cosmic Boy
Chameleon Boy
Superman X
New Genesis:
Highfather
Orion
Lightray
Mister Miracle
Big Barda
Dreamer Beautiful
Big Bear
Vykin Baldur
Serafina Baldur
Mark Moonrider
Serifan
Metron
Antagonists:
John Corben/Metallo
Conduit
Volcana
Doctor Hate
Bizarro
Eradicator
Grid
Rogue Kryptonians:
Dru-Zod
Faora
Quex-Ul
Jax-Ur
Mala
Apokolips:
Darkseid
Desaad
Steppenwolf
Kalibak
Grayven
Granny Goodness
Kanto
Virman Vundabar
Lashina
Stompa
Mad Harriet
Gilotina
Artemiz
Speed Queen
Knockout
Parademons
Doomsday
Imperiex
Mobius/Anti-Monitor
Sister Shadow
Mongul
Mongal
Leviathan Organization:
Anointed One
Gamemnae
Rama Khan
Tezumak
Sela
Kher Wild-Cats:
Majestic
Grifter
Fairchild
Ladytron
Spartan
Voodoo
Zealot
Maul
Others:
Lena Luthor
Emil Hamilton
Lana Lang
General Hardcastle
Detective Bowman
Dan Turpin
Margaret Sawyer
Bibbo Bibowski
Edward Lytener/Luminus
Mercy Graves
Bruno Mannheim
Earl Garver
Titano
Prometheon
Olgrun