The phrase "titular protagonist" refers to the main character or hero/heroine of a story or movie who shares the same name as the title of the work. Full definition
«Ivanov,» Anton Chekhov's first produced play, can be hard to love, with its maddening titular protagonist in the throes of depression and the discursive, repetitive ways in which the characters speak. (backstage.com)
Lady Bird is the writer / director's gentle, through passionately prickly look at the haze that lies just beyond adolescence, with Saoirse Ronan («The Grand Budapest Hotel») playing Christine, the also titular protagonist who must navigate the... (thecriticalcritics.com)
Ratboy Genius is the the titular protagonist of Ratboy Genius, which revolves around his adventures in his kingdom. (animedatingsite.com)