Kei

Kei Nishikori (錦織 圭, Nishikori Kei, [ɲiɕiꜜkoɾi Kei]) is a Japanese professional tennis player. He is the second male Japanese player to have been ranked in the top 5 in singles (after Jiro Sato), and the only one to do so in the Open Era. Nishikori first reached his career-high singles ranking of world No. 4 in March 2015. Nishikori has won 12 singles titles and was runner-up at the 2014 US Open, making him the first man representing an Asian country to reach a major singles final. He also became the first man from Asia to qualify for the ATP Finals, and reached the semifinals in 2014 and 2016. In addition, Nishikori defeated Rafael Nadal to win the bronze medal at the 2016 Summer Olympics, bringing Japan its first Olympic tennis medal in 96 years. He holds the record for the highest win percentage in matches extending to five sets, with a record of 27–7 and a win percentage of 79.4%.

Kei Koizumi is an American policy advisor serving as Principal Deputy Director for Policy for the Office of Science and Technology Policy. He previously served as a senior advisor on science policy for the American Association for the Advancement of Science after serving as a senior advisor to the National Science and Technology Council under President Obama.

Kei Nijimura is the main character's sister in Jojo's Bizarre Adventure: Jojolion.