Users possess uncanny intuition with magical phenomena all their myriad forms, allowing them to perceive and understand magic like no other, learn and master virtually any spell and school of magic with outstanding ease.
Their ever-growing understanding of the workings of magic soon allows them to extensively modify any spell available to them, drastically increasing their potency and efficiency, merge them into even more powerful ones, and even create her own arsenal of magical trump card, while intuiting effective countermeasures to most any spell and entity they come in contact with.
As their mystical prowess endlessly soars to ever-greater heights, they eventually reach a near-godlike level, triumphing of terrifyingly powerful entities and entire supernatural armies with little to no effort, often bounding them to service in the aftermath, forging unprecedented empires based on superior magical systems of their own design, and eventually ruling entire worlds of their own making, second only to genuine deities - and who knows for how long.
Roswaal L Mathers (Re:Zero); via Divine Protection of Sorcery
Deities of Magic (RPG's)
Nedians (Star Ocean: The Second Story)
Fai D. Flowright (Tsubasa: Reservoir Chronicle)
Caster Class Servants (TYPE-MOON)
Elphaba (Wicked); aka the Wicked Witch of the West
Freya Beauchamp (Witches of East End)
Ingrid Beauchamp (Witches of East End)
Gremory Clan (Highschool DxD)
Rossweisse (Highschool DxD)
Gondul (Highschool DxD)
Georg (Highschool DxD)
Le Fay Pendragon (Highschool DxD)
Vidar (High School DxD)
Female trolls (Trollz)
Diana's (Marchen Awakens Romance) knowledge of magic led her to eventually become the most powerful witch in all of MÄR Heaven.
Star Swirl the Bearded (My Little Pony: Friendship is Magic)
Twilight Sparkle (My Little Pony: Friendship is Magic), is well known for her intuitive grasp of most forms of magic.
Starlight Glimmer (My Little Pony: Friendship is Magic), has proven herself to be exceptionally talented at magic. After their fight, Twilight Sparkle admits that Starlight's magic is equal to her own.
As the ruler of Equestria, Princess Celestia's (My Little Pony: Friendship is Magic) knowledge of magic is the greatest in all the land.
Princess Luna (My Little Pony: Friendship is Magic), has the greatest knowledge of magic after her sister, Princess Celestia.
Albus Dumbledore (Harry Potter) is believed by many to be the most powerful wizard of all time.
Lord Voldemort (Harry Potter) is the most dangerous dark wizard of all time, and history's most powerful wizard after Albus Dumbledore.
The Tyrant King, Galbatorix (Inheritance Cycle) is arguably the most powerful magician in Alagaësia.
Having undergone harsh training from Galbatorix, Murtagh (Inheritance Cycle) is the second most talented magician in Alagaësia.
As one the greatest Kido masters in Soul Society, Tessai Tsukabishi (Bleach) can use powerful magic attacks and spells to manipulate space-time.
Hachigen Ushoda (Bleach) has profound understanding in Kido, allowing him continue his Kido research after exile from Soul Society and invent powerful and unique spells.
Sōsuke Aizen (Bleach) is a genius in the art of Kido...
... blocking Tessai's full powered Kido blast with a defensive spell even when he was a lieutenant.
Dr. Stephen Strange (Marvel Comics) has had an uncanny aptitude for the mystic arts even before becoming sorcerer supreme.
The Gremory Clan (Highschool DxD) are Devils with powerful magic potential.
Rossweisse (Highschool DxD) is a talented genius in Norse Magic.
Gellert Grindelwald (Harry Potter) was an outstandingly talented wizard and was admired and feared by many others of outstanding magical talent . Indeed, even Albus Dumbledore, had acknowledged Grindelwald to be near as powerful as himself,