Iona is the Mental Model of the I-401 submarine. She's one of the oldest Mental Models around and has spent roughly two years living alongside humans, which makes her unusually well-versed in how they actually live. She can pass for a regular person unless she deliberately shows what she's capable of.
After a major battle, she was placed in stasis and ordered to follow and obey Chigaya Gunzou. She's become his close friend—though she tends toward caution, she's come to trust that his riskier plans usually work out. Around the crew, Iona is quiet and genuinely helpful; she chips in with cooking, cleaning, and other daily tasks without making a fuss about it. She doesn't have any standout hobbies, though fans have noted she enjoys anime.
Her calm demeanor and practical nature make her the kind of person people naturally rely on, even if she doesn't seek that role out.
Content compiled by AnimeList.moe from publicly available sources.
