Gaap

"I cannot bind anyone, and will not be bound. I don't want to be loved, I want to love."

Gaap (ガァプ) is a demon with the power of gaps, holes that can reach almost anywhere. She is very fashionable and up-to-date on the latest trends. One of the 72 Great Demons, the 33rd highest ranking earl of the underworld as well as Beatrice's friend.

Background
Unlike most demons within the series, Gaap is not based off of a servant that Sayo Yasuda worked with. Instead, Gaap was created as a friend to Sayo to personify habitually losing things and play pranks on other servants at the Fukuin House.

Appearance
Gaap appears as a young woman with ginger-blonde "drill" hair and blue eyes. She wears an elaborate red dress with black lacing and lined with white embellishments. She also wears a small red hat adorned with a pink bow. There are red bows on her neck and waist. She claims her dress is called "Jack the Ripper: Christmas Blood" from the Devilish Pretty collection.

Legend of the Golden Witch
Gaap does not appear, however she is mentioned by Maria, who notes that the magic circle on the garden storehouse can invoke Gaap's powers of teleportation.

Alliance of the Golden Witch
Gaap makes her first proper appearance after being summoned forth by Goldsmith. After the first twilight, she uses her power to create gaps in the floor of the dining room, sending Nanjo, Kyrie, Krauss, Kanon, and Shannon into a dungeon in Kuwadorian.

Later on, she tests George for the inheritance of the Ushiromiya family. She fights against him for some time and outwits him in the end by opening a gap when Jessica was about to hit Ronove's shield and gets her and George to attack each other simultaneously, killing both instantly.

End of the Golden Witch
Gaap helps Beatrice save the illusion of Kinzo. When Kinzo was locked up in his study and risked destruction by Erika, she proposed to stay with him and, in case things went bad, she could make both of them dissapear with one of her gaps. However, Beatrice hinted at the danger they were in and refused to let Gaap take care of the situation since she was also at risk. She becomes impressed with Battler's salvation of Beatrice, sighing in admiration for him.

She later assists in the witch trial called by Erika and Bernkastel and calls Beatrice to her senses trying to make her give up the game and spare her life. However Beatrice decides to go for it all so Gaap can do nothing but watch Beatrice die and her illusion disappear.

Dawn of the Golden Witch
Gaap, along with all of Beatrice's entourage, tried to solve Battler's Logic Error issue and get Beatrice to the wedding for her final showdown with Erika. When Beatrice won the love trial against Erika, she hugged her with joy along with Virgilia, Ronove and the Seven Purgatory Sisters.

Requiem of the Golden Witch
Gaap is revealed to be a mere illusion of Sayo Yasuda's, created to justify with magic the incidents that occurred whenever Sayo was distracted during their job. Representing the playful nature of the Golden Witch Beatrice, from a magical point of view Gaap loves to play pranks on all the servants, especially on Sayo who is an atypical person.

She's first shown teasing Sayo over a cleaning tool in the Chapel. Gaap's presence is detected by them, who begs for her to return the small broom Sayo had been using to clean. After that day, Sayo and Gaap become friends, even though Gaap still pulled pranks on her new friend. When Sayo becomes responsible thanks to the "charms" Kumasawa gave the young servant, Gaap willingly changes their game to a challenge where Sayo must find the criminal of the story while reading mystery novels. If Sayo could find out the tricks and the criminal before reading the solutions, Sayo and the human side would win; failure would mean that the witch and the magical side won and the case would become a fantasy novel drowning the darkness of magic.

One day, Gaap took possession of Sayo's body to play a prank on a servant; amazed by the beauty of magic, Sayo decided to become a witch as well. They took on the name Beatrice and the title of the Endless Golden Witch, transferring to Beatrice some of the witch's characteristics such as her cackling laugh and the butterfly minions, while Gaap would become a new witch (nameless until Beato could think of a name) and Beatrice's friend in the golden "paradise". Gaap gains her name only after Beatrice meets Maria, who gives Gaap her current name and her role as a demon. Afterward, Gaap is depicted as she is in all the previous games in the series.

Umineko no Naku Koro ni Tsubasa
Gaap makes a short cameo in Beatrice's White Day when she suddenly emerges from a refrigerator and asks Beato why she's making Valentine's chocolate on White Day.

Trivia

 * Gaap is based off of the demon Gaap from the Lesser Key of Solomon.
 * Gaap is the only creation of Sayo's whose appearance is not based on a servant that Sayo worked with.