Pen Pen, or Pen² is a "hot spring penguin" and Misato's pet. He lives in a custom refrigerator in Misato's apartment, enjoys taking warm baths, eating whatever food he can get his hands (or wings) on, and going to hot springs. He also appears to have a relatively high degree of intelligence, as he is also shown watching TV and reading newspapers. He is voiced by Megumi Hayashibara in the Japanese series. His English voice actors are Amanda Winn-Lee during the series and movies, Mandy Clark in the "Director's Cut" episodes, and Monica Rial in the Rebuild of Evangelion series. In the manga, he is the result of a genetics experiment at Misato's former workplace, and she adopted him after the experiment's conclusion rather than let him be euthanised. His wingtips have retractable claws, which normal birds do not have.