What does Shinobi shout?
I'm playing again, after more than 30 years, the Shinobi saga: do you know what does he shout while doing his special move? It sounds something like "hoo-ree-ah", but probably it's something meaningful.
From native Japanese speaker's perspective, Shinobi 1's voice sounds like "とりゃあー！"(toryaa) which means absolutely nothing other than shout.
As for the Shadow Dancer, that also sounds like "うりゃあー！"(uryaa) or something like that, and this one also means absolutely nothing other than shout.