While it may look like some Laser Cats to most of you, us history buffs know that Lasers were not discovered in Japan until 1714, much later than when Tenchu IV takes place. So, these cats can't shoot lasers, but they can do other awesome things. Like look cute and distract enemies.
Thinking of a ninja's arsenal, kittens don't really come to mind. They're prone to make noise (which could mean certain death for a ninja) and they take up a lot of space in a satchel. This space could be used for more deadly ninja stars. But, hey, we're not complaining. We love kittens. Even the fake kind in video games.