The user of this power possesses and is able to utilize strong demonic power. This ability not only grants the user great strength and control over numerous variations of demonic abilities but also allows them to overwhelm weaker demons as well as rival that of powerful demonic entities.
Samael (Darksiders) is a powerful Demon Lord who is said to possess power great enough to rival that of the Dark Prince, Lucifer.
Being the eldest son of Sparda, Vergil (Devil May Cry series) possesses demonic powers that make him more than a match for any lesser demon, and allow him to match and even surpass his brother Dante in battle.
As the son of Vergil, Nero (Devil May Cry series) is a demonic-human hybrid that possesses great demonic powers that allow him to defeat powerful demons, those who gained an increase in power from the Ascension Ceremony and even hold his own against Dante.
Unlike his half-brother, Sesshōmaru (InuYasha) is the first full-demon son of Inu no Taishō...
...As a Daiyōkai, his demonic power is far superior to that of his brother's and surpasses other demons he encounters.
Although he is a half-demon, Inuyasha (InuYasha) inherited incredible demonic power from his father, allowing him to battle on par with and overwhelm most full demons and Great Demons,...
...and even master the Tessaiga and various demonic powers.
Although he didn't possess much demonic power at the beginning, Naraku (InuYasha) increased his power as he collected more shards of the Shikon Jewel and absorbed multiple demons and their abilities into his body.
Bankotsu (InuYasha) wielded Banryū, a large halberd that became a demonic weapon after killing 1000 humans and 1000 demons, it possessing the wrath of over 2000 lives that it turn into demonic power.
After absorbing the celestial being Princess Kaguya, Kaguya (InuYasha) became an extremely powerful Daiyōkai with a wide range of demonic abilities.
The Four War Gods (InuYasha) were four powerful Daiyōkai. Although strong with their demonic power diminished, their Power Spheres grant them their true powers, making overwhelmingly strong for any lesser being.
Being reborn a specter of the Netherrealm, Hanzo Hasashi/Scorpion (Mortal Kombat) acquired various abilities and weapons that allow him to take on any combatant.
Blade of the Archfiend (Ninja Gaiden) was forged from a meteorite infused with Vazdah's demonic magic, giving it tremendous demonic power which rivaled the divine power of the True Dragon Sword.
The demon, Inferno (Soul series) is the will of the demonic sword, Soul Edge. As the driving force behind Soul Edge and Nightmare, it can gain power from the souls of its slain enemies, and corrupt the mind and body of the host.
Soul Edge (Soul series) is the powerful demonic that houses Inferno as its soul.
...Nightmare is the host, wielder, and living incarnation of the cursed sword, Soul Edge. As a wielder of the demonic blade, Nightmare possesses terrible power that allows him to dispose of multiple armies...
Kazuya Mishima (Tekken series) possesses the Devil Gene, a supernatural genetic abnormality of the Hachijo bloodline. It allows him to access his Devil form, increasing his strength, obtain a flight, project powerful lasers, and mix his family style of fighting with his supernatural powers.
As a descendant of the Mazoku warrior, Raizen, Yusuke Urameshi (Yu Yu Hakusho) possesses demonic strength and power that surpasses even that of Sensui's S-class Sacred Energy, which is said to be the echelon of power.