What video game are the ninjas from?

As explained by agent86 in his answer on gaming.stackexchange:

The ninjas are from a fake 80's videogame created for the movie, called Dojo Quest:

Here's an article about the licensed games in the movie:

The filmmakers licensed characters from real-world video games for the movie, but they opted to craft a fictional title starring a ninja-fighting heroine named Lady Lisa (played by Ashley Benson), who serves as an unconventional love interest for Gad's character. To promote "Pixels," Sony released a side-scrolling mobile game resembling "Dojo Quest."

"Lady Lisa was in the first draft of the script, and I thought it would be fun to create just one game that didn't exist back in the '80s," said Columbus. "It never occurred to me not to do it. I felt like we could get away with it. A character like Lara Croft could've worked, but I loved the fact that Josh Gad's character has been pining for this woman all his life."

I have no idea why a 2003 game is in there (they're all supposed to be from the 80s?), but this looks exactly like I-Ninja. Here's a still from the film and some I-Ninja pics for comparison. Note in particular the eyebrows and the eye-hole pattern. If this is supposed to be a new character, it's at the very least heavily influenced by this one...

[OK, maybe it's not an exact replica (they removed the headband and added sleeves), but the design is too similar for this to be a coincidence. Either they purchased the rights, ripped I-Ninja off or I-Ninja ripped off some old, hitherto unknown source that Pixels used.]

I think they are from the arcade game Nibja Kids and Lady Lisa looks to be based off the main character from an old taito arcade game called Legend of Kage.