However, Mr. Grin, Alex's seemingly unassuming neighbor, could be considered a relatively static character.
* He doesn't undergo significant personal growth or change. He remains a mystery throughout the book, and his true nature as a MI6 agent is revealed gradually.
* His role is primarily that of a mentor and protector. He guides Alex and helps him navigate the dangerous world of espionage, but he doesn't change much himself.
While Mr. Grin's actions and motivations become clearer as the story progresses, he doesn't experience the same level of internal change as Alex, who learns about the world, deals with grief, and develops his skills as a spy.
It's important to remember that static characters are not necessarily bad characters, but they serve a different function in the story than dynamic characters who evolve and change.