Chiaki Nanami (七海 千秋 Nanami Chiaki) is one of the characters featured in Danganronpa 2: Goodbye Despair.
She has the title Ultimate Gamer (超高校級の「ゲーマー」chō kōkō kyū no “gēmā”).
She is actually revealed to be an Artificial Intelligence along with Usami, created by Chihiro Fujisaki pre-despair and modified by Alter Ego to be a mole for the Future Foundation.
She was executed along with Monomi after being voted guilty in Chapter 5, where she was tricked into accidentally killing Nagito Komaeda.