Why does Satan send Cerberus to Poppy?

She accidentally addresses her Christmas wish to him instead of Santa.

How does Satan become Poppy's legal father?

He appears as Lucifer Morningstar and adopts her to stop the orphanage from taking her.

Satan and His Little Believer

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Satan and His Little Believer — A six-year-old orphan's spelling error brings the Devil and a disguised hellhound into her lonely life.

Six-year-old Poppy survives in a dilapidated shack after her parents perish saving others. A Christmas Eve typo directs her wish to Satan instead of Santa. The Lord of Hell responds by dispatching Cerberus, stripped of two heads and wearing a red bow, to guard her as a puppy named Pippy. The hellhound speaks to her and repels intruders. When school bullying intensifies, Satan manifests as a colossal shadow to scatter the tormentors, violating infernal law and suffering grievous wounds from black lightning. Moved by Poppy's gratitude, he adopts her as Lucifer Morningstar to prevent the orphanage from taking her. On Christmas, he storms Heaven, scorched by holy light, to retrieve her parents' souls for a final farewell.

Quick answers

Why does Satan send Cerberus to Poppy?: She accidentally addresses her Christmas wish to him instead of Santa.
How does Satan become Poppy's legal father?: He appears as Lucifer Morningstar and adopts her to stop the orphanage from taking her.