Oh, it was before 1990. I was a teenager in the 80s and there was a lot of ninjas in movies, cartoons and graphic novels by 1987, I'd say, with it all starting before then.
In Denmark we have a rather popular trilogy of books/movies called Ternet Ninja which is about the vengeful spirit of a samurai who gets trapped in a little ninja doll and teams up with an awkward teen boy in a boring Danish neighborhood where everybody is a bit crazy.
The trilogy, outside of just being a lot of goofy fun, is actually also a bit of social critique of child labor in third world countries and how we in the west benefit from children's suffering.
The man behind Ternet Ninja is a Danish comic who's been making children's entertainment for years and has this extended universe where Ternet Ninja fits into. The topic of child labor and western exploitation of children is a reoccurring theme in a few of his storylines.

They never left, they just got better at Ninja-ing so you aren't noticing them. https://www.youtube.com/watch?v=WtR2m20C2YM
If they were good ninjas we wouldn't have known about them.
We should Ask A Ninja what happened.
I refuse to believe this series is 20 years old.
They clearly got better at it.
Ninjas, then vampires, then zombies, followed by superheroes.
You forgot pirates.
Go ninja go ninja go ninja GO!
Wait, no, come back!
GO. GO. GO. GO!
Apparently it's still the 90s in BotW-era Hyrule because I can't hardly go anywhere without getting ambushed by banana-obsessed ninjas.
When you think about it, the ninja you see has already failed (unless of course there’s a second ninja using the distraction).
What if ninjas are always everywhere but in the 90s they weren’t that sneaky?
Batman is a ninja too.
Ninjas -> Pirates -> Vikings -> knights cyclus
Zombies -> vampires -> werewolves have a similar rotation
For all we know, they could still be around. Who can tell with ninjas?
Wu tang is for the children.
That's what you get when just about every white kid 5-17yrs was in a McDojo, trying to be Daniel-san, and the leftover ones started choosing ninjas over karate kids. 🤷🏼♂️
Unsure what the fuck it has to do with Star Trek tbh
Edit: oooh wait, I misread your username as the community name 😅
No worries - you aren't the first to do that, lol.
Unless you go back to the 80s and those ninjas, then the list is not complete.
Sho Kosugi defined ninja in the 80s
Lee Van Cleef in The Master
Enter the Ninja
So many good video rentals for friday nights and pizza.
James Bond was fighting along side ninjas in 1967.
Daredevil was a super-popular comic at the time, along with X-Men [featuring Wolverine]
Daredevil fought a ninja army called 'The Hand,' and the near-immortal Wolverine was revealed to have studied the ninja arts in his past.
That lead to the Teenage Mutant Ninja Turtles, who fought The Foot Clan.
Also daredevil was taught by Stick. But the tmnt had to settle for a Splinter.
I never picked up on that.
I'll eschew tastelessness and not make a blind joke.
That’s Real Ultimate Power!
"We weren't 'online' we did lines! Yeah! And there were fucking ninjas on the lawn trying to kill us!"
Appreciating the rare Surf Ninjas mention.
They've gotten better.
Now all of those secret, stealthy ninja's have been replaced by flock cameras. /s
I remember this era it was like if you weren't a ninja, training to become a ninja, or doing some kind of ninja support work—it was like wtf are you doing? Are you a nonja? A fucken... noneja? Go back to your dojo and try harder.
Also a spoonful of orientalism mixed in there, as my culture likes to do.
They didn't attend a Dojo.
They went to a Dontjo.
"We should run!"
"We should hide!"
"We should kick their butts!!"
And for a few years after..
realultimatepower.net
I ended up watching the movie after seeing this comment.
and I believe that you are ninja too!
They're still there.
They just got better at remaining in the shadows, and now you don't even know who they are!
Ninjas ready!
Half-Life too.
Money can't buy knives.
Anime still does Ninja shit. Naruto was huge until just a couple years ago and that's all about ninjas.
Some ninjas persisted into the 2000s by shifting into the prankster niche. They might still be around but they are ninjas and very good at hiding so I can never be sure.
I liked this recent tv show https://en.wikipedia.org/wiki/House_of_Ninjas
Scorpion is not a ninja.
Edit: I'm an idiot. Yes, he was.
He was the only survivor or the Shirai Ryu clan enemies of the Li Kuei, but both were ninja clans
Nostalgia
nostalgia noun nos·tal·gia nä-ˈstal-jə nə-, also nȯ-, nō-; nə-ˈstäl- 1: a wistful or excessively sentimental yearning for return to or of some past period or irrecoverable condition also : something that evokes nostalgia
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