Aha, I have decided to make a thread about characters...
From Ninja Gaiden and DOA
Ryu has the demeanor and wisdom of a man far older than he, due to his prolific lineage and mantle of station as a respected ninja. His exploits have given him an outlook on life far removed from most others, and he understands things in more abstract and philosophical terms. Much like Gen Fu, he adopts a tranquil nature, much akin to water; free flowing most of the time, but unforgiving and crushing when roused. Through the Dead or Alive tournament, he has extricated himself from many of the subplots involving other characters, concentrating instead purely on the larger goals that present themselves. He and his ninja brethren have been direct players in the defeat of every major threat in the DOA tournaments, himself defeating the rogue Tengu, Bankotsu, in single combat during the second tournament. Ryu has befriended several people from the DOA tournaments, notably Jann Lee, who he shares a mutual respect with (indeed, in the fourth game they challenge each other to a sparring match after engaging in a nunchaku exhibition reminiscent of Bruce Lee's Enter the Dragon).
There are various videos online, if you're in the mood
You can read some of his subtitles, pre in this one (whoodeedo! lol)
"I do this for justice"
"An imperfect soul leads to an imperfect life"
Seems E1, yes?