This was another idea I posted, but I love it to all hell, despite the heavy historical inaccuracies. I makes me feel a bit conceited when my favorite Meiling idea is from myself. If I were to suddenly be blessed with writing abilities and drawing abilities, for sure, this would be one of the first ones I'd work on.
Meiling was a Chinese trader that decided to hang out with Remilia since she was the only European that would give her shelter during the tensions that led up to the First Opium War. Due to how human-like she was for a youkai, she was not initially aware that she herself was a youkai. She was the one that helped spread rumors of an elixir of life, and was one of the 500 girls that aided Xu Fu in his search for the elixir. She initially contributed her longevity to one of the various potions she herself tested during the search. She's an honest trader, so she knows how to act around guests and humans.