Often called the Efficient Baxter, he is Lord Emsworth's secretary (although he routinely loses and regains this job), and an expert on many things, including Egyptian scarabs.
Not the most emotional of men, his head is rarely turned by women, although on one occasion, meeting Sue Brown but believing her to be Myra Schoonmaker, he finds himself approving very much of the idea of an heiress to sixty million dollars.
Lord Emsworth finds him invaluable, but begins to question his trust when Baxter is discovered in the middle of the night, in the midst of a sea of upset tables, broken china, and food.
Not long after he arrives, he is disturbed while searching for the manuscript, and leaps from the library window to land in a flowerbed at Lord Emsworth's feet, adding to the Earl's poor opinion of Baxter's sanity, an opinion worsened further when, at the climax of proceedings, he is found hiding under Sue Brown's bed (a young girl for whom he had developed some affection, on the basis that she was a wealthy heiress, and was disgusted to find was an impostor).
Unable to stay away, Baxter returns again in Uncle Fred in the Springtime, where he is employed by the grouchy Duke of Dunstable, who visits the castle as a friend of Lady Constance.