Final answer:
The first genre that allows composers to show their own characteristics is the Romantic genre.
Step-by-step explanation:
The first genre that allows composers to show their own characteristics is the Romantic genre. During the Romantic era, which lasted from the 19th century to the early 20th century, composers sought to express their individual emotions and create their own unique musical voice. This genre emphasized individuality, imagination, and the expression of emotions in a lyric and song-like manner. Composers such as Brahms, Tchaikovsky, Schumann, and Chopin are well-known representatives of the Romantic genre.