|Relatives, etc.||Haruki Tachikawa (Brother)|
|Anime debut||Episode 1|
|Manga debut||Chapter 21|
|English Voice||Terri Doty|
Yuko is an average sized teenage girl, with shoulder length brown hair and brown eyes with a warm expression. She is often seen wearing her school uniform, along with a pair of red glasses.
Yuko is a kind person who cares about her friends, as seen when she wanted Shinichi and Satomi to patch things up. She enjoys teasing Murano about her crush on Shinichi. Though she may become easily infatuated, as she quickly became attracted and started drawing pictures of Hideo Shimada. She even tried to talk him out of killing people, to no avail.
- The Parasyte -the maxim- anime series gave Yuko a more prominent role in the series, introducing her much earlier and had her recure throughout the series. Whereas in the manga, she was only shown during the Hideo Shimada section of the series.
- She is the only full-blooded human in the series to survive direct conflict with a parasite.