Shun Akiyama (秋山 駿, Akiyama Shun) is a recurring main character in the Like a Dragon series first introduced in Yakuza 4, wherein he is a playable character. He is also playable in Yakuza: Dead Souls and Yakuza 5.
He is an extremely wealthy entrepreneur with a net worth of ¥100 billion popularly known as "The Lifeline of Kamurocho" (神室町の駆け込み寺, Kamuro-chō no Kakekomi-dera) due to his willingness to lend money with no interest to those with nowhere left to turn, provided they pass his tests. He runs Sky Finance alongside his assistant Hana, as well as Club Elise, a hostess club which he commonly uses in his tests.

Born in 1978, Akiyama was considered a golden boy when he was younger, one of the privileged youth who would aspire to do great things. He entered Toto University and graduated with top honors and a business (law in western releases) degree at the top of his class. His talents were sought after by Akihiko Yamori, the head of the Touto Bank's investment branch, who offered Akiyama a position - which he accepted.

He quickly became the top employee in the investment department. He rose up in the ranks and started dating his fellow employee Eri, and the two eventually got engaged.

However, disaster struck in the Spring of 2005 when he was fired from his job with charges of embezzlement after it was discovered that a sum of ¥1,000,000 was taken from one of his clients' account and deposited into his own. In actuality, the money was part of a laundering scheme carried out by Kyohei Jingu before the events of Yakuza. Yamori was the one who sold out Akiyama and had planned the whole thing from the start.

Although Akiyama was innocent, it was a losing battle against Yamori, who had been very thorough in his plot to frame Akiyama, destroying all traces of his involvement. Akiyama spent all of his life savings trying to prove himself innocent. As a result, he ended up homeless on the streets of Kamurocho, his fiancée leaving him for the man who had fired him.