Jiro/Zi-O

In 2008, Jiro (次狼) is the human form of Garulu (ガルル) and servant to Wataru Kurenai. In present day, he comes serve Yuko Kitajima.

Zi-O
"Love is painful. Being able to endure it is what makes a man truly a man"

- Jiro's advise to Sougo Tokiwa before parting. Jiro appeared alongside the other Arms Monsters to aid Yuko on her conquest to become the queen of the world. After the first fight with Zi-O, Jiro was seen in his human form drinking coffee at Café mald'amour as usual, only to say that the coffee had become bad due the manager change and he only came because the waitress is beautiful. For unknown reason, he said to the waiter that the world was coming to an end.

The next morning, Jiro appeared again and helping Yuko to fight Geiz until he got interrupted by the meteor he had foreseen which later to be revealed as Kamen Rider Ginga.

After Sougo and the others failed attempt on facing Ginga alone and failed too on asking Yuko to corporate, Jiro witnessed Sougo's fall because of covering Yuko from Ginga's projectile attack and left. In the evening, Jiro finally had enough and warned Sougo that Yuko is nothing but a liar and attacked Yuko after she tended Sougo's injury, only to be interrupted by Sougo.

Jiro fought briefly until Yuko left the scene. After both had stopped their fight, Jiro gave Sougo Kiva Ridewatch. He said to Sougo that love is hard but able to surpass the pain is what makes a man to be a true man. Jiro was no longer seen afterward even when Yuko still summon the Arm Monsters, revealing that he had no need to perform his role any longer.

Personality
In Zi-O, it is shown Jiro is also willing to follow a king, provided they are a good one. He saw potential in Sougo Tokiwa and tested him, eventually trusting him and giving him the Kiva Ridewatch. If he does not like the ruler, he will betray them at all costs, as he did with Yuko Kitajima who he described as "rotten to the core."

Portrayal
Jiro is portrayed by Kenji Matsuda (松田 賢二).der Ixa]], his suit actor was Jiro Okamoto (岡元 次郎).