Black King Nero is a significant character in Monster Hunter Riders, acting as the leader of the antagonists known as the Black Apostles. His executive members include figures like Esmeralda and Ramarsh (Hilda's alter ego), and the group is a central part of the game's plot. While Nero's exact monster companions aren't explicitly detailed, the Black Apostles are a major force threatening the world, as shown in the game's storyline.

Role: Black King Nero is the leader of the Black Apostles, the primary antagonistic organization in Monster Hunter Riders.

Antagonists: The Black Apostles, led by Nero, are the main antagonists of the game.

Executives: Key members of his group include Esmeralda and Ramarsh (Hilda's alter ego).

Plot: The group is a central part of the game's storyline and presents a major threat that the main characters must confront.