Which character was adopted as the official Warner Bros. mascot, and featured in cartoons such as 1951's "Hare We Go"?
Bugs Bunny
Title: Bugs Bunny
Passage: Bugs Bunny is an animated cartoon character; created in 1940 by Leon Schlesinger Productions (later Warner Bros.  Cartoons) and voiced originally by Mel Blanc.  Bugs is best known for his starring roles in the "Looney Tunes" and "Merrie Melodies" series of animated short films, produced by Warner Bros. During the golden age of American animation, his popularity increased.  This era led to his becoming an American cultural icon and the official mascot of Warner Bros.  Entertainment.
Title: Hare We Go
Passage: Hare We Go is a 1951 Warner Bros. "Merrie Melodies" cartoon starring Bugs Bunny.
Title: Herr Meets Hare
Passage: Herr Meets Hare is a 1945 Warner Bros. cartoon directed by Friz Freleng, under the "Merrie Melodies" series.  This short, coming a few months before the collapse of the Third Reich, was one of the last major wartime cartoons from Warner Bros. It was released 4 months and 17 days before Adolf Hitler committed suicide.  "Herr Meets Hare" also sets up two important facets of Bugs Bunny: one in which Bugs would realize he "should have made a left toin [turn] at Albukoykee".  The other is an extended dance sequence in the middle, which would later be retooled by Chuck Jones into "What's Opera, Doc? ".
Bugs Bunny Hare We Go