Gifftarians are a type of demon created using the Giff Stamp by consuming its human host.

A new kind of demon, the Gifftarian was hidden in the human body and released by the power of Giff Stamp. It has fighting strength that far exceeds that of a Phase 2 Deadman. In addition, the existence of the stamped person is extinguished when the Gifftarian becomes an adult and cannot be separated as in previous contract cancellations.

Each time a Gifftarian is defeated, its remnants are absorbed into Giff.

Hosts:
-Unnamed excavator

-Unnamed Deadmans follower

-Yosuke Okuda

-Chigusa Yamagiri

-Kanae Motomura

-Four unnamed Deadmans followers

-Unnamed man

-Unnamed child

Arsenal:
-Faregud: A sword protruding from both forearms that boasts a sharpness which can easily cut through steel. Normally absent, they are generated by the Gifftarian at will.

Abilities:
-Energy Slashes: A Gifftarian can launch purple energy slashes using its Faregud blades. It is also able to combine them into a single X-shaped slash.

-Tail Elongation: A Gifftarian can extend its tail over long distances .

-Regeneration: Gifftarians are able to regenerate lost limbs.

Vistamps:
-Giff Stamp

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Personality: Gifftarians have no remorse whatsoever for the humans that they consumed, regarding them as no lesser than food and considering them to be "delicious". They also seem to obey Olteca completely as he is the one who created most of the hosts seen so far.

History:
In 1971, a Latin-American excavator finds the Giff Stamp and stamps himself, later becoming a Gifftarian himself. The whereabouts and status of this Gifftarian is currently unknown.

In the present day. as Olteca is in possession of the Giff Stamp after the Fenix raid on Deadmans Base, the Deadmans general began to collect the remaining Deadmans members. One of the followers, an elderly woman, is transformed by Olteca into a Gifftarian by stamping the Giff Stamp on her body, effectively killing the woman in process. This Gifftarian is later defeated by Kamen Riders Revi Volcano Genome and Vice Barid Rex Genome.

The next Gifftarian host is Yosuke Okuda, Julio's former best friend. Just as both Julio and Yosuke are reconciling, Olteca captured Yosuke and stamped him with the Giff Stamp. This incident enrages Julio enough to transform him into his Wolf Deadman Riot form, and slaughtered the newborn Gifftarian with one strike.

A Gifftarian with an unknown host was later created by Olteca during the siege on Hiromi and Tatsuhiko Tabuchi, and is defeated by Daiji as Kamen Rider Live. Not long after, Chigusa Yamagiri is sacrificed by Olteca in front of Hiromi as an act of betrayal and turned into the fifth Gifftarian. Hiromi, vowing to liberate Chigusa's soul, effortlessly soloes the Gifftarian.

After Olteca is arrested by Fenix, Aguilera came into possession of what she thought was the Stamp but it was later confirmed by Vice as a fake after Sakura takes it from her. Olteca still had the real one until he handed it over to Hideo Akaishi.

With Kanae Motomura's consent, she willingly sacrifices herself to become a Gifftarian.

Orteca later creates four additional Gifftarians from several cultists to Aguilera's dismay.

Orteca later creates two additional Gifftarians from amongst several unconscious civilians. They are defeated by Holy Live and Jeanne.