Owned by the eldest son of a bookstore owner (though it seems that the bookstore owner's daughter Yume-chan is the one who cares for him). He always carries a book with him, and is often turned to for information. He seems to know a lot about science and literature due to his love of reading. He is a little taller than the Ham-Hams, partially due to his tall ears. He has a crush on Sandy, though it is never initiated until Hamtaro tells him about Sandy's feelings. Maxwell has a love for acting, and knows how to act. He is also brave, and saved the ham-hams from danger in Maxwell's Big Scoop!. Maxwell can feel pressured when people ask a lot of him (like, thinking up a solution for every problem), and it sometimes leads to him getting angry.
Maxwell and Sandy are concerted a official couple in the English series since during the 13th episode Let's Dance, Sandy!, but in the Japanese show they are not official until the 156th episode A Little Love Story! when Maxwell reads a story of two lovers.