- The name Ikuko means "fragrance" (郁) or "education" (育) (iku) and "child" (子) (ko).
- Ikuko's surname Tachibana means "orange, tangerine" (橘).
- Ikuko's former surname Kamio means "add, increase" (加) (ka), "beautiful" (美) (mi) and "cherry blossom" (桜) or "thread" (緒) (o).
- It is possible that Ikuko passed away in an accident or illness
- It is revealed that Ikuko has a sister named Haruko Kamio.
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