The power to manifest a guardian. Technique of Summoning.
User can create/summon a guardian that may be physical or purely spiritual being, with appearances varying greatly from humanoid (with various weaponry and skills) to animal or even mythical being and will protect the user at all costs, and fight on their behalf. The guardian's strength may be driven by the user's force of will or physical movements, or by it's own independent will.
User may be able to summon portions as opposed to the entire entity, such as an arm alone, in order to reduce the energy consumption and space occupation. The guardian may either appear next to the user, allowing the user to stand on top, or surround the user as a form of armor, which can also be used to protect others.
Most Ajin (Ajin) can summon "Black Ghosts" like guardians, whom they can control telepathically.
Mayuri Kurotsuchi (Bleach) summoning his Konjiki Ashisogi Jizō, a giant creature who fights on his behalf, and whom Mayuri modified for various extra functions and precautions.
Sajin Komamura (Bleach) summoning his Kokujo Tengen Myō'ō, a giant armored behemoth of living spiritual force who mimics his movements and share their damage and healing.
Yachiru Kusajishi (Bleach) summoning her Sanpo Kenjū, two creature sword-fighters who mimic her movements, one preceding while the other follows after, making it very difficult to avoid all three strikes.
Rui Hachiōji (Code:Breaker) summoning her Dark Side, who was born from her negative emotions and Shadow powers, as a shadowy armor.
Saechika (Code:Breaker) using his Dark Side, who was born from her negative emotions and Shadow powers, to create his shadow armor.
Ansem (Kingdom Hearts) summoning Xenohart's Guardian for protection and to fight for him.
Harry Potter (Harry Potter) summoning his Patronus, which acts as a guardian force from the Dark creatures and is immune to the Dark Arts.
Dolores Umbridge (Harry Potter) summoned her skeletal cat Patronus, enhanced by Voldemort's horcrux that she wore.
Endo Mamoru (Inazuma Eleven) using his Keshin Majin Great to stop a shoot.
Star Platinum (JoJo's Bizarre Adventure) is Jotaro Kujo's Stand, a guardian which fights alongside and protects him.
The Hand (JoJo's Bizarre Adventures) is Nijimura Okuyasu's Stand.
Sasuke Uchiha (Naruto) summoning his fully stabilized Susanoo that has been empowered with his brother's eyes and Hagoromo's power.
Madara Uchiha (Naruto) finalizing his Susanoo, transforming it into a guardian of immense power that he compares to the Tailed Beasts.
Hagoromo Ōtsutsuki (Naruto) is the first person in the world known to have summoned Susanoo, utilizing it at its highest leveled form.
Indra Ōtsutsuki (Naruto) is one of the first people in the world to have summoned Susanoo, utilizing it at its highest leveled form.
Kakashi Hatake (Naruto) has been given both Mangekyō Sharingan by Obito's spirit, allowing him to summon Susanoo, in its highest form.
Shisui Uchiha (Naruto) summoning his Susanoo in its complete form, short of its finalization and stabilization.
Gekko Moriah (One Piece) summoning his Doppelman, his shadow, to fight on his behalf while he lazes around.
Emil Narud (Starcraft) manifesting his True Form into a guardian like being.
Jotaro Kujo summoning his Stand, the psychic manifestation of his fighting spirit.
King (Nanatsu no Taizai) using Chastiefol Form Two: Guardian.
The members of the Investigation Team (Persona 4) can all summon Personas for combat.