Koharu is a short and slender young girl with maroon hair, fair skin, and asparagus-green eyes. She also braids her hair and keeps it in a side ponytail with a cherry blossom-shaped clip. She is the daughter of Professor Sakuragi, and normally attends school in Vermilion City.

On the outside, Koharu appears to be detached and cold when she talks to other people. She is also very aloof (so she prefers to keep to herself most of the time), but she does have a few friends. Despite this, Koharu has a prickly side, as she often gets verbally aggressive towards people that upset her. She is easily exasperated and dislikes when people make assumptions about her, which has caused her to put up a wall around herself.

Koharu is childhood friends with Go, and shows that she cares about him by reminding him to behave and do his homework. Koharu is often accompanied by her families' Yamper during her travels. However, she is studying in school rather than going on a Pokemon adventure with Ash and Go.

(Source: Pokémon Wikia)