There is an animation in which the protagonist has a blue pet and fights with something similar to a gun. It belongs to Hong Kong and Taiwan!

"100,000 Cold Jokes" is a domestic cartoon serialized by DreamWorks, and it is an original cartoon with a demon spirit. It consists of a series of short stories. The current short story seems to have nothing to do with it. In fact, the relationship is very subtle, and the way of dialogue is also very popular among netizens. Known as "China's version of Japanese peace". Now, with the efforts of the original author Wu Han and the original comic DreamWorks, this cartoon has been made into an animation, and some famous domestic seiyuu such as Shanxin and Baomu Zhongyang have participated in the dubbing of the animation.