Who is the voice actor of the hero character from the movie The Little Mermaid?
The Little Mermaid refers to movie_title = 'The Little Mermaid';
SELECT T2.`voice-actor` FROM characters AS T1 INNER JOIN `voice-actors` AS T2 ON T2.movie = T1.movie_title WHERE T1.movie_title = 'The Little Mermaid' AND T2.character = T1.hero