Three-Sword Style swordsman and member of the Straw Hat Pirates. He can use a frighteningly powerful technique called "Demon Aura Nine-Sword Style Ashura". He understands the "Breath of All Things" and can cut through iron.
This character is known as story-mode Zoro, or just story Zoro.
One of the two very strong units you are guaranteed to get from the game, story mode Zoro is the DEX tank captain, i.e. one that doubles ATK and HP of units of a given colors (most other colors and classes have them, but they are usually RR). He is a staple captain of most newbie and intermediate teams (unless their owners get lucky at RR and pull a better captain). Even for advanced players with many characters he still sees play due to his powerful captain ability. His three sockets are decent, and he can be socketed in a number of FNs. His biggest weakness is a weak special, as even most intermediate bosses and many grunts will not be hurt by his ~20k ATK. Still, he is a good character that can both be a worthwile investment of boosters to MAX his levels, and a good recipient of ATK and HP cotton candy. DO not give him RCV candy, however - save it for good characters with a healing special or captain's ability (if in doubt, just stockpile the RCV candy till you get your Eneru).
Socket guide: the usual Bind/Despair/Matching Orbs/CD/Autoheal are good choices.
With the release of version 6.0.1 on OPTC Global in late February 2017, this form of Zoro now has a super evolution, evolving into Roronoa Zoro Bird Dance, who is a much better unit that can be used for some end-game content. However, AI Zoro still has uses, as his captain ability is good. Plus, the evolved version is no longer Sengoku-friendly.