Yamashita Yasuo (
Yasuo is an average looking teenager with black hair that he covers with a snapback cap that he wears backwards and a thin sprinkling of facial hair on his chin. He is usually seen wearing a casual t-shirt and jeans.
Yasuo is a rebellious youth who doesn't care much for his father's situation. However, despite his seemingly tough demeanour he shows his father, Yasuo is actually quite timid but hid due to his affiliation with Grandia. After Tokita Ohma effortlessly took the entire Grandia crew down, Yasuo changed his ways and became hard working.
He was first seen taking money from his father and then heading off with his acquaintances. When he was next seen, he was chilling in his house with the same acquaintances. Being affronted by Tokita Ohma, he then witnessed the man effortlessly take care of the entire Grandia crew. With Ohma's push, Yasuo turned over a new leaf and soon enough began working at a construction site.
He returns home after the Kure attacked the house and joins Kenzo to his journey to the island where the Kengan Ahnilation tournament was being held.
Yasuo met Narushima Koga when his father decided to have him working for Yamashita Trading Co. He then met Gaoh Ryuki and informed Koga that Kazuo decided to have Ryuki living into their house too, much to Koga's anger. After Koga left the house in anger, Yasuo asked Ryuki if he had any relatives and, when the "spitting image" topic came up, Yasuo informed Ryuki that Tokita Ohma was "not with us anymore".
Yasuo was present when his father, while they where having dinner, scheduled Koga's fighter entrance exam and Ryuki's third kengan match (against Akoya Seishu).
When Xia Ji ambushed Kazuo and Koga at their house, Yasuo and Ryuki were shopping together. After their salvation, Yasuo phoned his father to inform him about Koga's critic situation and to tell him that him, Ryuki and Akiyama Kaede were all good.
Days after he received a phone call informing him that Tokita Ohma was still alive.