Thaddeus Gardner is the father of Marie-Grace Gardner; Marie-Grace refers to him as "Papa".
- Name: Thaddeus Gardner
- First Appearance: Meet Marie-Grace
- Mama Gardner: Late wife
- Marie-Grace Gardner: Daughter
- Daniel Gardner: Late son
- Luc Rousseau: Brother-in-law
He is the physician in the city. After his wife and son died, he left New Orleans in search of a place to call home. After traveling a while, he finally settled back in New Orleans.
He's often gone for long hours and overnight. He's very protective of Marie-Grace and doesn't like her having to care for herself. He is considered a hero by others because he has saved the lives of many.