The Anti-Euclid

"Truly a masterpiece worthy of the new world. Go, our creation! Crush the minds and hearts of all things! Devour the remnants of this planet!"

- The Core=Heart upon releasing it's creation

The Anti-Euclid is a supporting character in Kamen Rider: The End. An eldritch abomination constructed by the Core=Heart as a secret weapon to oppose the Gear Riders.

Personality
The Anti-Euclid doesn't possess a consciousness in the sense that we would imagine. It does however display aggression toward all other living things. Meanwhile, it is relatively neutral to other Altered, implying something resembling loyalty. However, it's very presence seems to invoke an involuntary sense of disgust and urgency among all that view it, even it's fellow Altered. While the Core=Heart is proud of it's creation, hints of uneasiness occasionally make themselves manifest, implying that the Anti-Euclid is a truly alien creature to this dimension.

Appearance
The Euclid can only be described as a grotesque mockery of what a Gear Rider might look like. The entity (as seen) is dressed in an orange "Rider Suit" complete with various maws and teeth across it's exterior. The "helmet" too is also comprised of jaws, angled in a "v"-shape. At any time, the jaws on it's "suit" can open to reveal a fleshy body within, filled completely with sharp teeth and fangs.

The entity can also stretch and modify it's solid mass into any shape and form at any time. When it utilizes this power, it will appear almost blurry. This implies that the Rider-ike appearance is merely a cover for the undead monstrosity that truly lies within.

Trivia

 * The inspiration behind The Anti-Euclid'smysterious abilities can be attributed to H.P. Lovecraft, the known author of the Cthulu Mythos.
 * Due to a limited CGI budget, the Anti-Euclid's stretching ability is only seen twice throughout the show.