In a show, the character uses the following kitchen knife. I've never seen anything like it before; what is it?
Here it is in action:
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That looks like a variant on an ulu knife, a knife whose blade is below the handle.
After seeing that GIF, I am 99% sure the animator thought up the design by themselves, probably to add some element of interest to the show, but without thinking about the practical side at all.
The animation shows the knife being used in a chopping motion, like a cleaver. But here is what a cleaver looks like
And this video can be used as a reference for proper use of a cleaver. We see slicing, chopping and rocking motions:
The knife in the anime is inferior to the cleaver shown above.
Considering these design problems, I hope nobody has had the idea of actually produce such a knife and use it in a real kitchen.