How are tock and humbug alike in the story The Phantom Tollbooth?

Both Tock and Humbug are loyal companions to Milo on his journey in The Phantom Tollbooth. They each have unique personalities that complement Milo's character, with Tock being wise and dependable, while Humbug is more whimsical and sometimes self-centered. Together, they help Milo navigate the challenges he faces in the Kingdom of Wisdom.