The pixiv post has a bunch of seemingly useless tags like "ど、どうか猫と胡椒さんも・・!!", but apparently no copyright/character tags or even "Original". So I'll put in the character and copyright requests in case knows more than me.
”Shio to Koshou/Shio and Koshou”(塩と胡椒, lit. "Salt and Pepper) is a popular ”Let's Play” video player duo in NicoNico Douga. Their videos are renowned for Koshou's screams of terror. Shio is in charge of actual gameplay and his friend, Koshou serves as the narrator and adviser. Their signature emoticon is ”塩゜Д゜)(＾ω＾胡”. The golden retriever is Shio's dog, Kai-kun.
