Fastidious J. Spiffington is a recurring villain from the Jetix series Yin Yang Yo! He is a small hamster with a cultured British accent, obsessed with cleanliness and world domination. Fastidious is nearly always seen inside a hamster ball that serves as the control center for his robots, mainly his Hamsterbot. He has a habit of drastically increasing his pitch whenever exclaiming certain words, such as "Activate!!" He seems to be a certified attorney.