Alex Periwinkle, known as the Milk Rabbit Father, serves as the Sylvanian Village doctor. His warm smile calms patients, proving especially effective with infants whose stomachaches ease at his reassurance. He makes house calls by bicycle to examine children with fevers or illnesses, dedicated to community health.

Beyond medicine, Alex frequently photographs his family to preserve their memories. Capturing these moments requires patience due to his active child Henry. Alex maintains a routine of reviewing these photo albums over evening tea.

His family connections include Kate Periwinkle, referred to as "Mrs. Periwinkle" during birthday celebrations in season 3. Alex appears in nursery activities (season 2, episode 11 "Play time at the nursery") and attends family events like Mrs. Periwinkle's birthday across two season 3 episodes. While not directly referenced in season 4 (Peony) episode descriptions, the series' focus on community and family suggests potential involvement in Periwinkle-centric episodes. Information regarding appearances in films, OVAs, or spin-offs outside the Mini Story series does not exist.