Maisie doesn't let anybody tell her no is an example of:

Character trait These are just a few descriptive adjectives used to describe someone's personality, and that is exactly what character traits are. They are words used to describe how characters act during certain situations or what kind of people they are.

it ends with a marriage, but also with prospero giving up his power.

the tempest is a play written by william shakespeare between 1610-1611, it narrates the story of prospero a magician that sets a storm to wreck a ship, this sets the story to kill the king of naples. while it is a romantic style play, it isn´t traditional because of the ending, it end with the marriage and the magician giving up his powers.