An unseen youth assistant who apparently advises Lucia inside the dungeon and urges her to keep killing.
During her fight with Donut, Lucia repeatedly looks toward an empty location and argues about points and whether the battle should end. Donut hears her identify the invisible interlocutor as Alexandro, her youth assistant, though the recap edits out his name.
Alexandro is reportedly angry when Lucia accepts a draw and later tells her everyone must die after Cici's death. Youth assistants normally care for underage entrants removed from the dungeon, so his apparent presence or communication is anomalous.
Not visible on the recap or to Donut; perceived only through Lucia's responses.
Alexandro may be an external controller or companion shaping Lucia's unstable choices.