Who is the character, Smudge, important in the story?

Prince Brat and Jemmy meet Smudge in the city, where he provides one of the awakening experiences for Prince Brat. The handshake exchanged by Smudge and the prince provides the first feeling of friendliness and trust for the prince. While Smudge is only a minor character, the importance of their handshake is a pivotal moment in Prince Brat's turnaround.