A holographic recreation of a celebrated soprano with whom the Doctor rehearses La bohème in 2373, finding her temperament far harder to manage than her voice.
Giuseppina Pentangeli is a holodeck character based on a renowned opera singer of the 22nd century. She appears in the third-season Voyager episode The Swarm.
The Doctor, who has taken up opera as part of expanding his programme, chooses her as his partner for the duet that closes the first act of Puccini's La bohème. The diva proves vain and imperious, criticising his singing and insisting on her own superiority until he is tempted to delete her.
During the rehearsals the Doctor begins to forget the words, the first sign that his overloaded programme is breaking down. The scenes establish the love of opera that remains part of his character for the rest of the series.