Ryu Hayabusa: [to Foster] I get two kinds of payment. The first I have already recieved.
: [in response for Foster's betrayal] The second... is you. Foster!
Irene Lew: Ryu... Wait...
: Ryu, what is the payment you have already recieved?
: She's right in front of me [cue to Ryu and Irene kissing].
— Excerpt from the ending of the first NES game, Ninja Gaiden
: [his final words] Are you there Dragon Ninja?... All grows dark... and silent... I have staked my name... I have fought with all of my being... all to forge a future for the black spider clan, I have no regrets... Just as you have pursued a cause greater than yourself, so too have I... Dragon ninja... take my cursed blade...
Ryu Hayabusa: [accepting the blade with respect] ... Genshin
— Excerpt from the final battle against Genshin, in his final moments, Ninja Gaiden II (Xbox360)
Evil? The ninja way knows neither good nor evil.
— Genshin, Ninja Gaiden II (Xbox360)
My strength comes from training, not from some curse in my blood.
— Ryu Hayabusa, Ninja Gaiden (Xbox)
The Dark Dragon is MINE!... No objections, I presume?
— Murai, Ninja Gaiden (Xbox)