Ai

Ai, the oldest of the three, is a motherly 18-years-old sister. She is often wears a Santa-styled hat over her green hair, and is the only major character with large breasts, a fact which she is often reminded of by her youngest sister, Mii. Ai is very near-sighted and requires glasses to see clearly. Ai is an awful cook, but that unfortunately doesn't stop her from cooking anyway. Daichi, a young boy the girls meet on their travels, is the only one willing to eat her food. Ai has a heart of gold and is always ready to help others in need. She seems to be the de-facto caretaker of the sisters' pet ferret, Unagi. She also loves to relax by taking bubble baths. Ai is used to the traveling and non-aging and takes it in stride, mostly unaffected by it until she meets Daichi as an adult. Ai has the unique ability to speak to plants which leads her to often spending time talking to the dandelions which she, and her sisters, refer to as "popotan". They help guide her on her family's quest, to meet Shizuku.

(Source: Wikipedia)