It's Young Cosette!
In the 2012 film, Gavroche was portrayed by Daniel Huttlestone.
The French version was first. The cast included Maurice Barrier as Valjean, Jean Vallée as Javert, Rose Laurens as Fantine, Maryse Cédolin and Sylvie Camacho and Priscilla Patron as Young Cosette, Marie-France Roussel as Mme. Thénardier, Yvan Dautin as M. Thénardier, Florence Davis and Fabrice Ploquin and Cyrille Dupont as Gavroche, Marianne Mille as Éponine, Gilles Buhlmann as Marius, Christian Ratellin as Enjolras, Fabienne Guyon as Cosette, René-Louis Baron as Combeferre, Dominique Tirmont as M. Gillenormand, and Anne Forrez as Mlle. Gillenormand The original London cast included Colm Wilkinson as Jean Valjean, Roger Allam as the persistent Inspector Javert, Ken Caswell as the Bishop of Digne, Patti LuPone as Fantine, Zoë Hart and Jayne O'Mahony and Joanne Woodcock as Young Cosette, Danielle Akers and Gillian Brander and Juliette Caton as Young Éponine, Susan Jane Tanner as Madame Thénardier, Alun Armstrong as the villainous but funny rogue Thénardier, Frances Ruffelle as Éponine, Rebecca Caine as Cosette, Michael Ball as Marius, David Burt as Enjolras, and Ian Tucker and Oliver Spencer and Liza Hayden as Gavroche.[
First, it is spelled Valjean. And Cosette called Valjean father or papa, or toward the end of the novel Monsieur Jean.
Robert Madge
If you're referring to the movie, Cosette is played by actress Amanda Seyfried. It is hard to pin point for the stage production; as many actresses play her for the theatre production.
Since his parents are the Thenardiers, and he is not yet born when Fantine leaves Cosette with them, I would assume he was born in Montfermeil where their inn is located.
Jean Valjean goes to the barricades to protect Marius and ensure his safety because Marius is the beloved of his adopted daughter, Cosette. He risks his own life to help Marius escape and to save him from the impending danger at the barricades.
Gavroche was created in 1862.
Just 3---child Eponine, child Cosette, and Gavroche.
Le Gavroche was created in 1967.
The cast of Gavroche curieux - 1913 includes: Paul Bertho as Gavroche
The cast of Gavroche champion - 1913 includes: Paul Bertho as Gavroche
The cast of Gavroche savetier - 1913 includes: Paul Bertho as Gavroche
The cast of Gavroche mauvais commissaire - 1911 includes: Paul Bertho as Gavroche
Cosette was created in 1862.
Cosette Lee's birth name is Mabel Cosette LeGassicke.
The cast of Gavroche et la fatma - 1913 includes: Paul Bertho as Gavroche