Chiaki normally has a quiet and sleepy disposition, but she becomes a lot more lively when discussing games and concentrates hard when playing. She often uses gaming terms and game references. She has a number of unusual habits, such as dozing off while playing games and taking long pauses during her conversations to think about everything she wants to say. She tends to end her sentences with negative, indecisive phrases like "maybe" and "I think". But despite her usually calm and seemingly indifferent demeanor, she states that she wants to keep everyone alive. She views life like a video game, which is why she won't allow any killings; saying that video games are supposed to be fun, and that focusing on winning and losing is pointless.

Her official English voice actress is Christine Marie Cabanos.

Chiaki's voice is usually calm and relaxed. Not completely monotone, but very close to monotone.

Chiaki Nanami: Ch-Ee-Ah-Kee Nah-Nah-Mee