"I'm so sorry... I just wanted to get better...so you wouldn't have to worry anymore... I'm sorry..."
- Yonah is only recently aware of how bad her illness is and feels guilty for being a burden to her father.
- If given the choice, Yonah would be more than willing to die from her disease if it meant having her father there with her instead of away all the time.
- She loves her dad most of all and enjoys spending time with him and talking to him.
- Yonah is ten years old in part one, but still very childish. She talks very much like a younger child, enjoys being read to as well as reading, and makes comments like "There's nothing worse than a sad tree" when talking about her stories. She's innocent enough to believe fairy stories are true and accepts the majority of her dad's statements as gospel (unless already proven otherwise to her). Considering she was sleeping through the timeskip, she is likely just as innocent now.
- She has no idea how bad her terrible cooking is.
- Nier does his best to shield her from anything bad, though she knows about Shades and the like.
- Yonah is a very lonely girl. She's generally confined to their home by Nier's request, though Devola and Popola occasionally visit her and she's regularly given books from the library. Still, she regrets it and sometimes she slips out on her own to go to the library.
- She's actually fairly strong-willed and wants to help out. When Original Yonah found a single cookie, she insisted on her dad having the bigger half, and apologizes when a coughing fit makes her drop the cookie. Regular Yonah, upon discovering the extent of her sickness, proceeds to go off in search of a legendary Lunar Tear that she believes grows at the nearby abandoned Shade-infested shrine, though she feels guilty for it and apologizes to Nier when he finds her.
- She has an unfortunate habit of making things worse while trying to make things better. See the above point.
- Yonah is immensely kind. When she starts getting letters from a boy (believed by Nier to be Emil, but actually his butler who originally intended his letter to be read by Nier and then started a correspondence with Yonah as a result) asking for help, she immediately coaxes Nier into going to help him. She... may have inherited his Sidequest Syndrome.
- The poor girl is so lonely that she's got no concept of stranger danger. She'll befriend anyone, including total strangers writing to her out of the blue.
- While she is prone to disobeying when Nier isn't there, when he tells her something directly, she listens - though she still takes loopholes. For example, when he tells her to go home at the start, she does... and then goes back to the library to talk to Popola once he's left it.