Who is Ran Yakumo?
And why is she so fricking adorable?
Ran Yakumo is a youkai living in Gensokyo, the setting for the Touhou Project series and a small region of Japan that got locked outside of our world by a barrier put in place by Yukari Yakumo. She's a lot of things, including a nine-tailed kitsune first and foremost (putting her age at least at 800 during the events of Perfect Cherry Blossom), a shikigami and also the master of another shikigami, a youkai cat by the name of Chen. Despite the fact that it's a common joke among the Touhou community that shikigami are basically computers, she's capable of free will and what her shikigami powers actually allow her to do is power herself up through Yukari by following her orders, making their relationship one of master and servant. That'd also make Chen Ran's servant.