In 'deku meets future deku fanfiction', perhaps the future Deku warns the present one about upcoming threats. He could tell him about villains he'll face in the future and how to defeat them. This would give the present Deku an edge in his battles and also in his growth as a hero.
One possible plot could be that Villain Deku is on a mission to undermine the hero society and crosses paths with Hero Deku. They engage in a fierce battle where Villain Deku taunts Hero Deku about his ideals. In the end, Hero Deku manages to get through to a small part of Villain Deku's conscience, leaving him with some doubts about his villainous path.
Another plot might involve the older Deku being from an alternate timeline. He shows the younger Deku different ways he could have developed his skills and relationships, which makes the younger Deku reevaluate his own path as a hero.
Typically, a black magician in such fiction is often power - hungry. For example, in many books, they will stop at nothing to gain more magical power, even if it means harming others. They usually have a disregard for the normal moral code and are willing to use dark and forbidden magic.
In the Crescent world, Magicians and Magicians were two different professions. Magicians usually referred to humans who used magic to fight or assist in their occupations, while magicians referred to humans who mastered a variety of mysterious magic and usually did not directly participate in battles.
The difference between Magicians and Magicians was the type of magic they used and the level of their skills. Magicians can use all kinds of magic, including elemental magic, combat magic, summoning magic, etc. They usually have high magic skills and can create powerful magic items and perform complex magic operations. On the other hand, magicians mastered more complicated mysterious magic, including time and space magic, illusions, forbidden spells, etc. They usually had very high magic talent and deep magic knowledge, and could create more powerful magic items and perform more complicated magic operations.
In addition, there were some subtle differences between a mage and a magician. Magicians were usually considered a combat profession. They usually had a certain physical fitness and combat skills, while magicians paid more attention to the study of mysterious magic knowledge and skills. They usually did not participate in actual combat.
In the manga, Deku experiences various ups and downs. He not only becomes stronger physically but also matures emotionally as he takes on greater responsibilities. There are also many unexpected plot twists that shape his journey.
It could lead to a completely different character dynamic and story arc. Maybe she'd face different challenges and have a unique perspective on being a hero.
It's hard to say precisely without reading it. But generally, a novel named 'The Magician' might be about a character who is a magician. It could involve his adventures, his use of magic in a fictional world, his relationships with other characters, and perhaps his struggle between good and evil in the context of magic.