Short answers, pulled from the story.
The main character is Marco Pagot, a former World War I fighter ace cursed to have the head of a pig. He operates as a freelance bounty hunter in the Adriatic Sea and chooses isolation over the political chaos rising in Europe.
The film written and directed by Hayao Miyazaki was released on the 18th of July 1992. It quickly became the number-one film in Japan and grossed over 1.5 billion yen.
Porco's curse originated during World War I when he flew into a cloud to evade pursuers and emerged to find his squadron decimated. He witnessed the spirits of fallen airmen including his friend Bellini rise to join a vast formation of planes, leaving him with a profound sense of loss and isolation.
Gina is the owner of the Hotel Adriano who has waited for Porco for years with unrequited but unwavering love. She sits in her garden each afternoon hoping to see him, but he only visits her at night when the dim light obscures his pig-like appearance.
The final duel between Porco and Curtis begins as a dogfight but devolves into a boxing match when both planes guns jam. The confrontation ends with both men knocked out and falling into shallow water, forcing Porco to confront his own limitations and the consequences of his choices.
Fio Piccolo is the young granddaughter of Porco's mechanic who serves as a bridge between the past and the future. Her relationship with Porco evolves from professional to a deep bond as she helps him repair his plane and eventually joins him on his flight home.