there are 4 characters
A Fishy Story - 1913 is rated/received certificates of: UK:U
Alice's Fishy Story - 1924 was released on: USA: 1 June 1924
A Fishy Story - 1962 TV was released on: USA: 27 December 1962
The cast of A Fishy Story - 1920 includes: Esther Jackson Zip Monberg
The cast of A Fishy Story - 1962 includes: Norma MacMillan as Kokette Larry Storch as Koko the Clown
The question is unclear. Many things about characters are important in a story. If the characters are not believable, the reader won't care about them, and won't read the story.
Bleak in the story means that it was caught with nothing important.
Genesis Week - 2011 A Fishy Story 1-8 was released on: USA: 16 February 2012
Genesis Week - 2011 Still a Fishy Story - 1.9 was released on: USA: 23 February 2012
There are as many characters in an opera as necessary to tell the story. There is no fixed number.
Mickey Mouse Clubhouse - 2006 Mickey's Fishy Story 3-21 was released on: USA: 2 September 2011
There are many other characters besides just the main two. You can have sidekicks, helpers, minions, background characters (the people you meet but don't have much of a role in the actual story) -- you can have as many characters as you need for your story.