Anime with Demonic Weapons:
* Soul Eater: This anime features "Death Scythes" that are actually living weapons with demon souls inside. The users must train them to become powerful and fight against evil.
* Black Butler: Sebastian Michaelis, the demon butler, uses a variety of demonic weapons to protect his young master.
* Blue Exorcist: Exorcists wield weapons that are infused with demonic power, like "asura" swords and "kuro" hammers, to fight demons.
* High School DxD: This series features a wide array of demon weapons, from swords and lances to more unique and powerful artifacts.
Anime with Demons Bound to Contracts:
* Shaman King: Shamans can use spirits (including demons) as allies in battle, often binding them to objects or their bodies.
* D.Gray-man: Exorcists use "Innocence," weapons imbued with divine power to fight against the Akuma, demons who want to destroy the world.
Anime with Demonically-Powered Equipment:
* Naruto: While not directly demonic, the chakra-based weapons and jutsu in this series have supernatural origins and are often powered by nature's energy, including powerful demons.
* Bleach: Shinigami (Soul Reapers) use Zanpakuto, spiritual weapons that are essentially manifested souls, though not directly demonic.
Anime with a Similar Vibe:
* Fate/Zero: The series features "Servants," heroes and villains from history who are summoned as spirits to wield powerful weaponry and fight in a magical war.
Note: Some of these anime focus on the power of the demons, while others emphasize the connection between the user and the equipment.
Let me know if you'd like me to give you more detail on any of these anime. Also, if you have specific preferences (like a particular type of demon or a specific setting), I can try to find something more tailored to your taste!