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| Dayu | |
| Gender: | Female |
| Villain Type: | General |
| Season: | Power Rangers Samurai |
| Homeworld: | Earth Netherworld |
| First Appearance: | Origins - Part 1 |
| Last Appearance: | {{{lastepisode}}} |
| Number of Episode Appearances: |
19 |
| Actor: | Kate Elliott Rugen Du Bray (human) |
| Dalia | |
 | |
- Weaponry: Shamisen and Plectrum, and short sword (from her Shamisen)
- Powers(Att): Blasts from mouth; Super speed
Dayu is one of Master Xandred's two followers, a Futakuchi-onna female figure with a shamisen. Before becoming a Nighlok, she was newlywed to Deker. But when a fire burned their house down and almost killed Deker, she made a deal with a mysterious Nighlok who offered Deker's life back in exchange for her humanity. When she made the deal, he tricked her and instead turned Deker into his half-Nighlok self of today and erased his memories and changed Dayu into a Nighlok herself with only her shamisen by her side to remind her of her past. Of all the villains, Dayu is the only one who cannot let go of her past once making an attempt to reclaim it by kidnapping brides and using their sadness to create a wedding dress. Her plan failed due to the Rangers' interference, though she is saved by Deker. She is a powerful fighter as she took down both Kevin and Mia at once. Her shamisen, which she calls her "Harmonium," has a hidden short sword in the neck which she uses for battle. She has a habit throwing the baki of her instrument at Nighloks' she gets angry at.