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I believe this type of magic would go well for him in integrating it with his sword style, not only that but he can merge them all when he reaches the peak in said magic (ex Solid Script(100) + Jutsu Shiki(100) = something(1)), to gain more powerful magic etc. (the 100 means he has reached the peak in those respective magic) Jutsu Shiki (術式 Jutsu Shiki) is a Caster Magic, and a form of Letter Magic utilizing Magic Runes. Dark Écriture (闇の文字エクリテュール Yami no Ekurityūru) is a Caster Magic and a type of Letter Magic and Eye Magic involving the usage of writing runes for various effects. Solid Script (固体文字ソリッドスクリプト Soriddo Sukuriputo) is a Caster Magic and a form of Letter Magic that uses animated words. Orient Solid Script (東洋の固体文字ソリッドスクリプト Tōyō no Soriddo Sukuriputo) is either a Caster Magic or a Holder Magic and, depending on its means of employment, a form of Letter Magic and variation of Solid Script that uses drawn kanji for attacks. Illusion Magic (幻影魔法 Genei Mahō) is a Caster Magic related to illusions.
How about giving MC Space and Time magic it will definitely go well with his swordsmanship specially space he can teleport, create space slash , space Wrift , and once he complete master of space he opens Space Domain and for time , he can stop time , accelerate or slow time down and he uses time magic on his eyes he can read his opponent movements and see few seconds in future
uh author sama you should give him a special flame magic and call it Red King Magic just call it that and it will literally be mikoto suoh his flame power the sword mc uses could look like the sword of damocles that mikoto suoh from k project has that floats above him when he fights against another king idk if u ever even saw the anime or anything but the cover pic is a pic of mikoto suoh and it would just be cool and perfectly fit the mc