Mr. Losberne is a country doctor and old family friend of the Maylies. He’s unmarried, and if he were young enough, he’d probably have a thing for Rose (heck, he might have a thing for her anyway). He’s very attached to that family, and actually moves to the country when they leave Chertsey because the neighborhood is too boring with them gone. He’s friendly and gregarious, always ready to pity the unfortunate, but he’s also abrupt and reckless, and occasionally stubborn. No wonder he gets along so well with Mr. Grimwig.