Maru is a villager who lives in the Mountains north of Pelican Town and is one of the twelve marriage candidates. She lives with her family in the house attached to Robin's carpenter shop, and her appearance changes at work: in the Social Status menu, she wears a nursing uniform while she is at Harvey's clinic.
Maru works as a nurse at the clinic on Tuesdays and Thursdays, and she also keeps up with her scientific interests at home. After marriage, she moves into the farmhouse, adds her own room to the right of the bedroom, and sets up a small outdoor work area behind the farmhouse where she sometimes works on gadgets. She continues visiting the clinic on Tuesdays and Thursdays after marrying the player.
Her daily schedule varies by season, weather, and special events. On regular days she often stays in her room in the morning, uses the lab in her home, and later sits on benches near town before heading home at night. On rainy days she tends to remain indoors longer and may spend time in the house’s store area and lab. If the Beach Resort on Ginger Island is unlocked, she may randomly spend the day there, but she never visits on Tuesdays, Thursdays, or festival days. On her first Green Rain year, she stays in Sebastian's room all day. She also has special schedules for the Desert Festival, and on Spring 16, after bus service is restored, she rides to the Calico Desert for the festival.
Maru is closely tied to several townspeople. She lives with her parents, Demetrius and Robin, and her half-brother Sebastian. She has a strained relationship with Sebastian and wishes they were closer. She is friends with Penny and is often seen sitting with her on the bench south of the Saloon. She also works with Harvey, and both worry that his clinic does not get enough patients. At the Flower Dance, she will dance with Harvey if the player is not dancing with him.
A few details stand out about her presentation: her portrait shows her wearing glasses even though they are not visible on her sprite, and three of her portraits have no nurse-uniform equivalent, so she uses the surprised portrait when those expressions would normally appear.