Japanese word for "doubt" or "suspicion" (疑惑)
To turn Sailor Mercury against the other Senshi
Giwaku is a droid sent by Esmeraude to fill a vulnerable spot with dark energy. She can create several clones of herself that will vanish if attacked. She can also use her antennas to make people hallucinate and think their friends turned on them.
Esmeraude sent Giwaku to the vulnerable spot located in Ami's school. Everyone there fell under her spell and accused Ami of cheating. Ami discovered Giwaku and transformed into Sailor Mercury to fight her. Giwaku used her clones to attack Sailor Mercury, and when the other Sailor Senshi appeared, Giwaku made Sailor Mercury hallucinate that they turned on her. However, her powers did not have a big effect on Sailor Moon, as she receives negative comments all the time. Her clones even threw Tuxedo Mask out the window when he arrived. However, what Giwaku didn't realize was that the power of friendship is stronger than her illusions, and Sailor Mercury destroyed her antennas with Shine Aqua Illusion. Then, Sailor Moon followed by destroying Giwaku with Moon Princess Halation.
- Giwaku's DiC dub name is Mistrust.
- Giwaku is among the many past villains that appear in Sailor Moon: Another Story.