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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.
Fastidious made his debut appearance in the episode "Neat Freak", when he ran into Yin at the cleaning store. He managed to goad Yin into capturing a trio of elemental spirits, and nearly succeeded. However, Yang was able to find out Fastidious was the real evildoer, and with the spirits' help, the rabbit twins beat Fastidious.