1. Answer: It depends on everyone's taste and these rankings change all the time. According to RankMyPorn, at the moment, the top ranked Mixed Ethnicity Female Pornstars in the world are: Gianna Dior, Eva Lovia, Mia Lelani, Zaya Cassidy, Uma Jolie, Roxy Lips, Darcia Lee, Amirah Adara, Vienna Black, Mila Jade, but these will change based on what people vote.
2. Answer: It changes. You can see the latest rankings on RankMyPorn.com and also vote on it for free.