Hikaru Gero is a character from the manga and anime series Marriage Toxin. He is associated with the Gero family, a clan known for its marriage-focused assassin tradition. Hikaru appears as a supporting character connected to the series’ central conflict and the protagonist’s world of assassins and matchmaking. His role helps expand the Gero family dynamics and the story’s blend of action, comedy, and romantic tension. He contributes to the series’ broader cast of unusual specialists and their interactions.