Shin Seiki Evangelion : Shito Ikusei

Neon Genesis Evangelion Shito Ikusei is a Japanese video game for the WonderSwan which was developed by Gainax and published by Bandai in 1999. This game has Tamagotchi-elements to it. You play as Ryoji Kaji. You have to take care of Adam, or "Shito" as it is named in the game, in an embryonic state. You'll be able to make it evolve through different options. It will evolve into different forms depending of its stats. You can then make it battle the three Evangelions of Shinji, Rei and Asuka. You can also explore different places from the Evangelion anime as Kaji himself, talk to different characters and acquire different items for Shito.