| Yuki Ouno|
|First Appearance(Manga):||Chapter 42|
|First Appearance(Anime)||Episode 1 (second season)|
Yuki Ouno (黄野由希 Ono Yuki) is Gachi Yellow.
He is the youngest of the team. He often exhibits childish behavior, such as eating ice cream or playing video games and hates people who call him a 'child'. When he transforms into Gachi Yellow, his weapon is a slingshot.
He appears in Episode 1 of Mitsudomoe Zouryouchuu!. After the Gachi Rangers discover that the evil Gedol Empire is trying to eliminate children from the Saitama District and that they are turning everyone into a pile of bubbles, they decide to stop it. Gachi Yellow and Gachi Red go to save some children, but they are put in a situation to defuse a bomb to save them. The two started arguing over which wire to cut and in the end, Gachi Red decided to take it apart right then and there only to have the bomb explode right in their faces, killing all the children in the process. Later, they joined the other Gachi Rangers helped them fight Crabron. To attract him in order to fight, the other Gachis forced Yuki to dress up as a schoolboy, which was successful. The battle culminated in a giant robot vs. monster duel. Upon defeating him, all the children return back to normal.