"For I am the Good Witch Azura, Warrior of Peace!"
Quoting the fantasy she isn't a part of, but hopes to be.
"For I am Luz the Human, Warrior of Peace!"
Including herself in the fantasy now that she has a chance, albeit with the acknowledgement she isn't a witch.
"For I am the Good Witch Luz, Hunter of Monsters!"
Fully recognizing herself as a witch.
"For I am the Good Witch Luz, Child of the Human Realm, Student of the Demon Realm, and Warrior of Peace!"
Acknowledging not just herself as a witch, but as a human; These are not irreconcilable, and both defy Belos despite his claims to eradicate one for the other. Luz makes sure to specify herself as the result of those around her, who helped Luz get to this point. Luz has finally achieved the fantasy, and she’s grinning this time; No need to act dignified, Luz has won and she’s allowed to have fun and enjoy it. She’s earned this.