Witch's Kiss

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Please refrain from reading if you are not yet familiar with all the latest media released.

A Witch's Kiss is a marking, the personal symbol of the Witch, used by a Witch and its Familiars to control the minds of humans. They can be used to exacerbate pre-existing negative emotions and thoughts, change personalities, make people commit crimes or suicide, or lure them into a Labyrinth to be consumed by the Witch inside. While some of these actions may not necessarily lead humans to being consumed, some Witches may also desire merely to spread evil and misfortune regardless of if they get sustenance. Further, a Kissed human may not always die from it. Familiars can Kiss humans well outside of the Labyrinth they hail from in order to bring them to their Witch.

Instances

A list of examples that people under the influence of a Witch's Kiss are seen doing.

A woman jumping off the roof of a building (Episode 2, under the influence of Gertrud)
Hitomi Shizuki and a group of people committing suicide together, as if it were a cult (Episode 4, under the influence of H.N. Elly)
Members of the Sakura Family Church preparing to set fire to the Church, under the influence of an unnamed Witch.
Saki Asami, Niko Kanna, Mirai Wakaba, Satomi Usagi, Kaoru Maki and Umika Misaki planning to commit suicide, under the influence of Hungrige Pumpe.
Kimihide Mikuni under the influence of an unknown Witch.
A man setting fire to Natsume Books (Kako Natsume's story, under the influence of an unknown Witch)