Stahl is a member of Chrom's Shepherds and was trained by Frederick when he was a recruit. His olive-colored hair is always messy, as if he just woke up.
Stahl has an unnamed father and brother who run an apothecary. His support with the Avatar reveals that he was taught the trade, and he helps make a joint birthday gift for Chrom. His brother comes up in his supports with Lissa, where she helps Stahl find a rare ingredient for his brother's stomach tonic, which comes up in his supports with Maribelle.