Yoshimi is a customer of Gamers and Dejiko's fan. 

Di Gi Charat is a series of shorts created as advertisements for "Digital Gamers", a store in Akihabara. The series follows Dejiko, princess of Di Gi Charat planet, and her companions, Puchiko and Gema, as well as Dejiko's rival, Rabi~en~Rose through daily ordeals they encounter while working at Gamers. 
Princess Di Gi Charat came from the planet Di Gi Charat given only a cat cap and an outfit to disguise herself. Unfortunately she came with no money, only her guardian Gema and friend Petite Charat. Luckily the three stumbled upon a manager of the store Gamers, who offered them a home if they worked at the store. However Di Gi Charat is a selfish young girl who wishes of becoming a star.
 
(Source: Anime News Network)

Currently hosts a podcast titled "All Work, No Play" with fellow voice actor, Sam Riegel.  

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The Di Gi Charat Summer Special was a four episode series that aired over two days, August 22, 2000 to August 23, 2000. This was the first series that Piyoko appeared in and the plot involves her attempting to hold Dejiko hostage for ransom. 
• Episode 1 - Here comes Pyoko-nyo! 
• Episode 2 - It's the Black Gamers-nyo 
• Episode 3 - The Return of Abarenbou 
• Episode 4 - Summer Bug