Wakizashi
they used a large arsenal including but not limited to the katana, doto, wakizashi, kanebo, and naginata
The same word is used.
between twelve and twenty four inches long depending on personal preference the average length was eighteen inches.
Together they are called daishō (meaning, big and small) the large sword is the katana and the smaller is the wakizashi.
Wakizashi
Most wakizashi are between the sizes of 12 - 24 inches.
Yes, in ju-jitsu, the katana and occasionally the wakizashi is primarily used.
The short answer is no. For starters, if you are referrring to the weapon commonly referred to as the 'Ninja-to', it is a creation of pop-culture and has no precedent in the history of Shinobi. Ninja's did however use Katana's and Wakizashi, which are made from Carbon Steel(literally an alloy of Iron and Carbon, with no other elements). Tungsten is added to some modern swords, but Katana's are generally still made from Carbon Steel, though modern steel can be used, such as L-6.
The term kodachi literally translates to "short tachi." During the Tokugawa era in Japan katana and wakizashi were only allowed to be carried by Samurai, The Tokugawa also placed measurement limits on what defined a katana (the samurai's soul) and the wakizashi (honor blade), the kodachi is to short to be considered a katana and to long to be a wakizashi. Kodachi were primarily carried by merchants. Also the forging process used to make a kodachi differed from that of katana and wakizashi. Kodachi were not originally made for dual sword techniques, but as a means of self defense for those that were not allowed to posses katana/wakizashi. Although due to the design and length kodachi could be dual wielded much more efficiently than a katana and wakizashi.
The Katana and the Wakizashi
No, Ninja dud not use shields. They did, however, have special light armor under their clothing. Ninja used their weapons as protection ex: Shuko (Ninja Claws) What ninja used to climb walls and catch swords with.
they used a large arsenal including but not limited to the katana, doto, wakizashi, kanebo, and naginata
Ninja stars are used to stun the opponent.
Ninja Stars
The katana and the wakizashi.
They are best known for their swords, particulary the long sword caleld the Katana; many also carried a shorter swrd called the Wakizashi. A matched set of a Katana and a Wakizashi is called a Daisho.