Well, the first two people that came to mind were Paul and Eris Greyrat from the Mushoku Tensei novel series -- both are humans.
In the world of Mushoku Tensei, there are three main sword styles known as the
Sword God Style,
Water God Style, and the
North God Style. The Sword God style focuses on all out attack, the objective being to cut down the opponent before being cut down; the elements of "speed" and "offense" essentially summarize the Sword God Style. The Water God style is the exact opposite of Sword God Style; it focuses on extreme defense that focuses on parrying and countering all attacks, including magic (or in this case, ninjutsu) and projectiles. The North God Style is the only sword style that doesn't have any fixed technique; practitioners fight using many tricks and each person develops a different way of fighting.
Sword God Style is weak to
Water God Style: because the SGS focuses on speed and straightforward offense, practitioners often get countered easily by users of the Water God Style.
Water God Style is weak to
North God Style: practitioners of the WGS cannot attack first while displaying Water God Style techniques, making it weak against the North God Style due to the latters characteristic of sudden attack, trick, adaptability, etc. which makes it hard to read and be properly countered by Water God practitioners.
North God Style is weak to
Sword God Style: this is due to the latter having a straightforward style that tends to overwhelm the opponent before being overwhelmed; there is no time for tricks.
Additionally, in the Mushoku Tensei world, there are ranks assigned to people depending on their mastery in a certain area of magic or combat. From top to bottom, in order of weakest to strongest, those ranks are as follows:
Elementary
Intermediate
Advanced
Saint
King
Emperor
God
Eris is a Sword King, as in, she's mastered the Sword God Style to the point that she has earned the title of King. To further emphasize the degree of her strength, in the Mushoku Tensei world, most people (especially humans) are unable to climb past the "Advanced" rank in anything for their entire lives. To emphasize
even further, Eris is one of only three sword kings in the world. She's very simple and straightforward, but rational, and I like that about her way of fighting. I feel like it's something I can emulate with my Kaguya biography since I like to go for the kill.
Paul has attained Advanced rank in all three sword style, which is considered incredibly rare since most people tend to dedicate themselves to a single style, or excel at one particular style while they aren't as good in another. He is able to adapt his fighting style depending on what kind of opponent he is facing. He someone with an "untraceable fighting style" -- not even the Sharingan would be able to replicate his moves since they would be physically unable to perform them. Once again, I can relate this to the unique fighting style of the Kaguya.
I may have went off on a tangent and wrote too much, but I believe this answers your question
