Yui Ikari (碇 ユイ?, "Ikari Yui") was an understudy of hereditary designing at Kyoto University, where she reached her future spouse Gendo and her guide and trusted companion Kozo Fuyutsuki. A short time later, she joined the UN Artificial Evolution Laboratory (the future Gehirn) in Hakone, Japan, and assumed a necessary part in the E Project. She served as the guinea pig for the Contact Experiment of Unit-01 in 2004, however "vanished" amid testing.
In spite of the fact that broadcasted dead, an a piece of (her "spirit") exists on inside Unit-01. Her Japanese voice performing artist is Megumi Hayashibara, who likewise voices Rei. Her English voice performing artists are Kim Sevier in the series, Amanda Winn-Lee in the movies, and Stephanie Young in the Rebuild of Evangelion series.