Hey! Thanks for reaching out! The Triforce isn’t seen as a good or evil force, since in some other games, Ganon uses the Triforce of Power to enhance his dark magic while Zelda uses the Triforce of Wisdom to enhance her good magic, so the Triforce is neither. The Triforce on Y/n’s hand just proves she has a piece of the Triforce, not what it’s used for, if you get what I mean. Y/n is the mortal with the Triforce of Power because, after the Triforce was used by Link to kill Demise, all three pieces needed to be protected. The spirit of the hero protects the Triforce of Courage, the females of the Royal Bloodline protect the Triforce of Wisdom, but the games never explained what happened to the Triforce of Power in really any of the games after Ganondorf is done using it. The Triforce, even a single piece, is used however the owner sees fit. And there was going to be a plot-line explaining how Y/n inherited her powers in the first place, but I had to cut it out because of time constraints. She’s pretty much always been fated, throughout the course of history, to hold onto the Triforce of Power since Hylia didn’t trust anyone, even her human form, with the entire Triforce. Feel free to reach out if you have any more questions!