I would think that Terry is less famous than Ryu. I've seen multiple people refer Ryu as "Ninja Gaiden"
Terry is an SNK character, which means that if you're unfamiliar with SNK, then you probably don't know Terry. And the margin of people not knowing SNK vs knowing Ninja Gaiden is a lot higher.
Terry is an SNK character, which means that if you're unfamiliar with SNK, then you probably don't know Terry. And the margin of people not knowing SNK vs knowing Ninja Gaiden is a lot higher.