From the article, "Its surprising the success Japanese mascots can find. (No, I'm not talking about Mr. Sparkle.) I'm talking about characters who were originally designed to act as a mascot for a company or product, which suddenly reach new heights of popularity and become a marketable figure on their own.
So it isn't surprising when these icons suddenly get their own video games. After all, if they're successful and popular, chances are their creators will want to make as much money off of them as they can. Today, Important Importables is going to look at Dejiko, Domo-kun and Docomodake, three mascots popular enough to merit their own games..."