Since the premiere, Gotham tells the origin stories of characters related Batman's mythology with a talented cast. Meet others potential characters who could be easily shown in the series.
Basil Karlo
Season: 2
Potential Episode Name: The Terror
Plot: Basil Karlo is a famous and talented actor who arrived in Gotham to filming his horror movie called The Terror.
Why: The Clayface is a classic villain of the Dark Knight. He could appear as a talented and famous actor of Gotham City. Basil is not a criminal yet.
Season: 2
Potential Episode Name: Cold Case
Plot: The Origin Story
Why: Victor Fries has a amazing origin story and he is a classic villain. He could appear as a genius in cryogenic studies and a good husband and citizen.
Season: -
Potential Episode Name: Master of Puppets
Plot: The Origin Story
Why: Arnold Wesker is the Ventriloquist and other classic criminal of Gotham. He doesn't know his close friend yet.
Season: 2
Potential Episode Name: Stranger than Fiction
Why: Hugo Strange is one of the greatest and dangerous enemies of Batman principally because he knows the secret identity of the hero.
Season: 3 or 4
Potential Episode Name: Noir
Why: He is one of the most deadly mercenaries of DC Universe and was one of Bruce Wayne's mentors.
Season: 3 or 4
Potential Episode Name: Deadly Lesson
Why: He is one of the most deadly mercenaries of DC Universe and was one of Bruce Wayne's mentors.
Season: 2
Potential Episode Name: Abracadabra
Why: John Zatara was a friend of Thomas Wayne and taught Bruce about escapist art. His daughter, Zatanna, is close friend of Bruce.
Season: 2
Potential Episode Name: Nine Lives
Why: Ted Grant is a legend in DC Universe. He taught boxing to Selina Kyle and Bruce Wayne.
Season: 1 (Season Finale)
Potential Episode Name: The Man Behind The Gun (part I and part II)
Why: Joe Chill is definitely the killer of Thomas and Martha Wayne.
Season: 2 or 3
Potential Episode Name: The Bat and the Fox
Why: Fox is the CEO of Wayne Enterprises and a good friend of Bruce Wayne.
Season: 2
Potential Episode Name: Heartbreak
Why: Cornelius Stirk is one of the most bizarre and dangerous serial killer of Gotham City principally because of his favorite dish: fresh human hearts.
Season: 2 or 3
Potential Episode Name: Holiday
Why: He is an original character who could appear as a future Arkham inmate.
Season: -
Potential Episode Name: Crusade
Why: He is the Jean-Paul Valley's father.
Season: 2
Potential Episode Name: Snake Eyes
Why: He is one of the most deadly mercenaries of DC Universe and Bane's father.
Season: 2 (Halloween Special Episode)
Potential Episode Name: Born on a Monday
Plot: Alfred narrates an old Halloween tale about Gotham City.
Why: Cyrus Gold is the real name of Solomon Grundy who would appear as an urban legend narrated by Alfred during the next Halloween.