What is Zoro's eye color?

Zoro is a tall, muscular young man with lightly tanned skin and black eyes.

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Then, which haki color is the strongest?

The manifestation of Black Lightning is the ultimate form of Haki because it uses "implosion Ryou"(flowing) and "Flaming"(hardening) to maximize the potency of his weapon and at the same time bypasses any defense. The attacks are so strong that they can one shot someone like Gear 4 Luffy, a 1.5 billion bounty man. What Haki has Franky? Franky will likely gain the power to use Observation and Armament Haki by the end of the Wano Country arc which has entered its Third Act already.

Regarding this, why did nico robin turn white?

Robin has always been white. She was tanned from living under the sun in Alabasta. The tan faded away after living under freezing conditions in Tequila Wolf with the Revolutionaries. Does Zoro have armament Haki? Yes both of them can use haki. Zoro can use all three types of haki along with luffy,he used conquerors haki in the fight with Monet and controls her body while Sanji can use armament and observation haki,he used his armament haki first time in the fight with Vergo.

Moreover, who is tashigi to zoro?

The only relationship that we know of between Zoro and Tashigi is the Tashigi is chasing after Zoro, his strength and person. Tashigi does look like his childhood friend Kuina, who died falling down the stairs holding her sword (bad way to go for a good swords woman). Correspondingly, what is dragon's df? Dragon, commonly known as the "World's Worst Criminal", is the infamous Supreme Commander (????, S?shireikan?) of the Revolutionary Army, who has been attempting to overthrow the World Government.

Keeping this in consideration, what are zoro's 3 swords?

Wado Ichimonji (white), Sandai Kitetsu (red), and Shusui (black), the three swords that Zoro owned from Thriller Bark to Wano Country.