Addendum:

The following personages appear in other stories of the Human Comedy.

Ajuda-Pinto, Marquis Miguel d'
Father Goriot
Scenes from a Courtesan's Life
The Secrets of a Princess

Bixiou, Jean-Jacques
The Purse
A Bachelor's Establishment
The Government Clerks
Modeste Mignon
Scenes from a Courtesan's Life
The Firm of Nucingen
The Muse of the Department
Cousin Betty
The Member for Arcis
A Man of Business
Gaudissart II.
The Unconscious Humorists
Cousin Pons

Blondet (Judge)
Jealousies of a Country Town

Brossette, Abbe
The Peasantry

Cadine, Jenny
Cousin Betty
The Unconscious Humorists
The Member for Arcis

Cambremer, Pierre
A Seaside Tragedy

Canalis, Constant-Cyr-Melchior, Baron de
Letters of Two Brides
A Distinguished Provincial at Paris
Modeste Mignon
The Magic Skin
Another Study of Woman
A Start in Life
The Unconscious Humorists
The Member for Arcis

Casteran, De
The Chouans
The Seamy Side of History
Jealousies of a Country Town
The Peasantry

Chocardelle, Mademoiselle
A Prince of Bohemia
A Man of Business
Cousin Betty
The Member for Arcis

Conti, Gennaro
Lost Illusions

Espard, Jeanne-Clementine-Athenais de Blamont-Chauvry, Marquise d'
The Commission in Lunacy
A Distinguished Provincial at Paris
Scenes from a Courtesan's Life
Letters of Two Brides
Another Study of Woman
The Gondreville Mystery
The Secrets of a Princess
A Daughter of Eve

Ferdinand
The Chouans

Gaillard, Theodore
A Distinguished Provincial at Paris
Scenes from a Courtesan's Life
The Unconscious Humorists

Gaillard, Madame Theodore
Jealousies of a Country Town
A Distinguished Provincial at Paris
A Bachelor's Establishment
Scenes from a Courtesan's Life
The Unconscious Humorists

Galathionne, Prince and Princess (both not in each story)
The Secrets of a Princess
The Middle Classes
Father Goriot
A Distinguished Provincial at Paris
A Daughter of Eve

Gerard, Francois-Pascal-Simon, Baron
A Bachelor's Establishment

Gobenheim
Cesar Birotteau

Grandlieu, Duchesse Ferdinand de
Scenes from a Courtesan's Life
A Daughter of Eve

Grindot
Cesar Birotteau
Lost Illusions
A Distinguished Provincial at Paris
A Start in Life
Scenes from a Courtesan's Life
The Middle Classes
Cousin Betty

Guenic, Gaudebert-Calyste-Charles, Baron du
The Chouans

Halga, Chevalier du
The Purse

Hannequin, Leopold
Albert Savarus
Cousin Betty
Cousin Pons

La Palferine, Comte de
A Prince of Bohemia
A Man of Business
Cousin Betty
The Imaginary Mistress

Lenoncourt, Duc de
The Lily of the Valley
Cesar Birotteau
Jealousies of a Country Town
The Gondreville Mystery

Lora, Leon de
The Unconscious Humorists
A Bachelor's Establishment
A Start in Life
Pierre Grassou
Honorine
Cousin Betty

Lousteau, Etienne
A Distinguished Provincial at Paris
A Bachelor's Establishment
Scenes from a Courtesan's Life
A Daughter of Eve
The Muse of the Department
Cousin Betty
A Prince of Bohemia
A Man of Business
The Middle Classes
The Unconscious Humorists

Maufrigneuse, Georges de
The Secrets of a Princess
The Gondreville Mystery
The Member for Arcis

Maufrigneuse, Berthe de
The Gondreville Mystery
The Member for Arcis

Portenduere, Vicomte Savinien de
The Ball at Sceaux
Scenes from a Courtesan's Life
Ursule Mirouet

Portenduere, Vicomtesse Savinien de
Ursule Mirouet
Another Study of Woman

Rochefide, Marquis Arthur de
Cousin Betty

Rochefide, Marquise de
The Secrets of a Princess
A Daughter of Eve
Sarrasine
A Prince of Bohemia

Ronceret, Du
Jealousies of a Country Town

Ronceret, Fabien-Felicien du (or Duronceret)
Jealousies of a Country Town
Gaudissart II

Ronceret, Madame Fabien du
The Muse of the Department
Cousin Betty
The Unconscious Humorists

Simeuse, Admiral de
The Gondreville Mystery
Jealousies of a Country Town

Stidmann
Modeste Mignon
The Member for Arcis
Cousin Betty
Cousin Pons
The Unconscious Humorists

Touches, Mademoiselle Felicite des
Beatrix
Lost Illusions
A Distinguished Provincial at Paris
A Bachelor's Establishment
Another Study of Woman
A Daughter of Eve
Honorine
The Muse of the Department

Trailles, Comte Maxime de
Cesar Birotteau
Father Goriot
Gobseck
Ursule Mirouet
A Man of Business
The Member for Arcis
The Secrets of a Princess
Cousin Betty
The Unconscious Humorists

Vernisset, Victor de
The Seamy Side of History
Cousin Betty

Vignon, Claude
A Distinguished Provincial at Paris
A Daughter of Eve
Honorine
Cousin Betty
The Unconscious Humorists