Willis

Willis is the main protagonist of Digimon: The Movie. He is partnered to Terriermon and Kokomon.

Digimon: The Movie
Although Willis is constantly mentioned by Kari, throughout her narration, he doesn't have direct screentime until the third segment. This is most likely a way to surprise the audience that he is the protagonist, and not Tai.

Trivia

 * He is first DigiDestined to partner two Digimons.