Rurouni Kenshin

(Note: I watched the dubbed version so i might use different terms)

Rurouni Kenshin Also known as Samurai X, is an anime/Manga about a wandering samurai named Kenshin Himura who was once the famous slasher called Batousai the slasher, as he gains more and more new friends, while trying to atone for his past sins.He also helps others using his reversed edge sword and his hiten mitsurugi sword technique. He has alot of enemies and most of his enemies are foes from the past searching for revenge.

On top is Kenshin Himura the main character
And below is Myojin Yahiko ( to be referred to as Yoshi)
The only regular student (SPOILERS due to the fact that Yutarō also learned the style yet only appeared once or twice SPOILERS) of The Kamiya Kasshin style And as the series progresses he becomes better and better at the Kamiya Kasshin style

Above you can see Kamiya Kaoru(referred to as Cory) the owner of the dojo and the master of the Kamiya Kasshin style
And Below is Sanosuke Sagara (referred to as Sano) he's a friend of Kenshin who uses his fists and in the beginning of the series his large sword

It has 3 seasons and 95 episodes,for complete information go here