Mr. DeLacey is the only person in the book who shows kindness to the creature. Since he is blind, DeLacey doesn't see the ugliness of the creature, and he's the father that Frankenstein should have been to his creature.
Victor Frankenstein is the selfish man who creates the monster. He's horrified by the creature's physical appearance and runs away from it, never giving the monster a chance to learn how to get along in the world.
The creature is Victor's creation who enters the world and then is left alone to fend for itself after Victor runs from it. He changes into a creature of revenge when Victor rejects his own creation and the rest of the world is afraid to be near it.
Robert Walton is interested in exploring the unknown like Victor, but he also shows compassion and pity to the creature. He reevaluates his own mission after hearing the story of the creature.
The only two of these characters who change (dynamic) are the creature and Walton. The rest of the characters are the same (static) and don't change during the book. I don't think Victor is a dynamic character because he remains selfish throughout the book. In the end, Victor doesn't care that Walton's crew might be put in danger by going after the creature, just as he didn't care about his creation.
The two main characters are Victor Frankenstein and his creation, The Monster.
They are dynamic characters because they undergo changes as the novel progresses. For example, the monster starts out life as a 'tabula rasa', or blank slate, and through social conditioning, ends up with a perspective on how life should be lived and what relationships are.