How about putting an anime knife in the living room? Will it affect Feng Shui?

Not necessarily, the different residential patterns lead to different suitable furnishings in the living room. For example, sometimes the knife is placed in the town house, and sometimes the conflict with the owner makes people weak. Generally speaking, it is best not to put it directly in the center or in the middle of the four directions.

. . . But anime knives. . . There should be no big problem. After all, if you don't cut the blades, your Sha Qi is not strong.