Antisepticeye

Antisepticeye, commonly referred to as Anti, is the fan-fueled idea of a dark and evil version of Jacksepticeye. He was initially idealized by Jack's fans due to his creepy thumbnails and videos. However, Jack has since taken the idea of the character and turned it into a reality, implementing aspects to make the character his own.

The general idea of Anti's character is that he's an internet-virus demon that is fighting for control over Jack's body and/or power. It is known that the viewers' idea of Darkiplier had largely influenced the viewers' formation of Antisepticeye.

Personality
Antisepticeye's personality is usually demented and with a strong desire to harm others. His mood changes from anger to seriousness to insanity in an instant. Anti foreshadows his appearances with camera, voice and/or video distortion, along with Jack describing feelings of queasiness, excessive eye/neck twitching with prolonged staring at the camera, children's laughter or static. Anti will leave hints in the video titles or video descriptions leading to an arrival. When he does appear, he usually takes sharp jibes at Jack, but occasionally likes to mock either the viewers or the other alter egos.

Anti has shown awareness of the other egos. This is evident in 'KILL JA̶CKSEPTICEYE' where he possessed Dr. Schneeplestein to prevent him from treating Jack, in 'The Jacksepticeye Power Hour - Jameson Jackson', where he takes hold of Jameson Jackson's body and points a knife at the viewers in a threatening manner, and in 'Dark Silence,' where he attacks Chase Brody and his children. Anti detests the other egos, calling them "puppets," and dislikes it when any of them try to aid Jack, claiming that Jack belongs to him and is his puppet.