Seven Samurai was a classic and introduced a young Toshiro Mifune who went on to make a number of classic films such as Yojimbo, Sanjuro, and a host of others. Seven Samurai was also the inspiration for the western movie "The Magnificent Seven. Yojimbo was remade into the Italian western movie "A Fistfull of Dollars." As mentioned, there was a series of samurai movies about the character, Zatoichi, a blind swordsman and Yakuza related character. There was a crossover movie made that had the actor that played "Zatoichi," Shintaro Katsu, and Toshiro Mifune in the same movie. It was billed as Zatoichi meets Yojimbo which was titled "Incident at Blood Pass," aka "Machibuse." However, Katsu did not play his character, Zatoichi. He instead played a mercenary planning an attack on the Shogun or some other important person traveling through the titled pass. Mifune also was not playing his Yojimbo character. He played a traveling samurai that also stopped at that location by coincidence and discovers the plan and works to stop the mercenaries/assassins.
I always liked Toshiro Mifune the best out of all the samurai actors. He seemed like the most skilled and the most suave, kind of like a James Bond of samurais. Two of my favorite western made movies with Mifune are "Red Sun" with Charles Bronson (set in the old US West) and "The Challenge" with Scott Glenn.
Another Japanese actor that played in a number of samurai movies was Tomisaburo Wakayama. He played a Ronin (masterless samurai) who used to be the Shogun's main executioner until he disobeyed his master and escaped to become a fugitive along with his young son. Several of his movies were spliced together into one movie called Shogun Assassin. These movies were part of a series called the Lone Wolf and Cub. Most American audiences will recognize Wakayama from a small part he played as a Yakuza member in the movie "Black Rain" with Michael Douglas and Andy Garcia.