A particularly calm and generally cheery individual from 2008, Umi represents all that there is about future police work. Provided that police eventually start recruiting giddy little school girls. No, to be fair, she has a pretty even attitude and a scarily analytical mind. She has a very upbeat and laid-back personality and enjoys watching the other stories from the sidelines. It is quite difficult to keep anything secret from her, as her fascination with Sherlock Holmes has produced a story which can nail you if you so much as farted in the process of committing a crime. Or just ticked her off. She is also the group’s gun fanatic, preferring to spend time at a shooting range. Unfortunately for the shooting range, she is quite prone to shooting other people’s targets when she’s completely shredded her own. One of the first things everyone should know about an angry Umi is where her gun is.

• Her hair is styled according to her main character, Sasaki Hitoko. The bunny ears are a nod to her name.
• Her jacket is a standard-issue International Civil Defense Corps uniform jacket. It contains packets of impact-resistant liquid which solidifies when impacted by items like a bullet. This is in addition to the Kevlar-like outer material, making the jacket resistant to most small arms fire. It also contains a small electronic setup which includes bio monitors and a link that allows a radio to transmit using the jacket as an antenna.

Guns

• She, along with Sandy and Kelsey, form the backbone of the multiverse.
• She is directly connected to Celia, Misty, Constance, Dule, Lucia, and Jerry.
• Dule considers her a "big sister" figure since her story is a direct sequel to Umi.