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Roronoa Zoro's Two Sword Style, better known as "Nitoryu" in Japanese, is a significant part of his swordsmanship in One Piece. Originated from the actual Niten Ichiryu, which literally means "Two Heavens-as-One Style," it is one of the oldest techniques the samurai used to master dual-wielding swords. This clearly shows that Zoro is versatile and proficient as a swordsman before being a Three Sword Style user.
Zoro often uses one sword in each hand to afford both attack and defense in the Two Sword Style. One of the basic stances used by this style is the Nigiri stance, where he holds the two swords parallel to one another on his side. This form is the lead-up to many of his quite potent attacks and clearly demonstrates the versatility of the style and Zoro's strategic approach toward fighting.
The Two Sword Style balances Zoro's power and precision. However, in relation to his Three Sword Style, it lacks the raw power but has focused and controlled attacks in contrast with his three-sword technique. It makes the Two-Sword Style highly effective in situations when Zoro has to adapt himself very fast or save energy in a prolonged battle.
Excluding Zoro, one of the most famous practitioners of the Two Sword Style is Kozuki Oden. Oden formed his own variation known as the "Oden Two Sword Style," which he used with the two legendary swords Enma and Ame no Habakiri. What's very interesting about his form is that he would use Emission-level Armament Haki with this dual-sword method, in which very few swordsmen have succeeded in this series.
It doesn't only apply to the One Piece fictional world; there is actually a two-sword style officially known in Japanese kendo. This would, in most cases, involve the use of a long and a short sword. The basis of this etches depth and authenticity into Zoro's use of this technique through the series.
Through it all, Zoro's One Piece narrative has evolved and is powered by his Two Sword Style techniques. Notable Nitoryu attacks include "Toro" for "Climbing Tower," a technique where Zoro creates two air-based projectile slashes by jumping upwards, and its follow-up, "Otoro," which means "Reply Climbing Tower." All these demonstrate the style in close-quarters combat but also from mid-range.
The two-sword style also had to be instrumental in developing Zoro. It serves as a bridge between his one-sword and three-sword style and was indicative of his growth in being a swordsman. His ability to switch between the flows of these three styles fluently in battle shows his adaptability and how he has learned comprehensive sword fighting.
One of the interesting things about the two-sword style used by Zoro is how it fuses with his developing ability to recognize and utilize the various types of swords. For example, if he was unable to identify the Nidai Kitetsu blade in Wano at first, now his skill has advanced to the level at which he could easily recognize such a legendary sword. This growing expertise also enhances the effectiveness of his Two Sword Style by better using the unique properties of different blades.
In the vast world of One Piece, the Two Sword Style is one of the more vital ways to engage in combat. While not as common as single-sword techniques, it's respected and feared in its right when mastered. The prestige and effectiveness that come with legendary figures like Oden wielding this very same style only add to that.
One could almost belittle the Two-Sword Style of Zoro to some extent by stating that it would never be able to shine as much as his Three-Sword Style. However, considering this, the actual strategic value of Nitoryu cannot be belittled for Zoro overall fighting style. Nitoryu itself, otherwise known as Two Sword Style, represents Zoro's ability to improvise in many combat situations or conserve energy when he must, surprise an opponent expecting a three-sword attack.