Jin strongly resembles his older brother Shoichi.He has long Purple hair which is messy and grey eyes.He is seen wearing grey colored shirt with sleeves ending halfway down his elbows and pants. As a child, he had short hair and wore a short-sleeved, light blue shirt and a pair of khaki shorts.
According to Yusaku after being rescued from Hanoi Project Jin developed intense PTSD and even now he is still suffering from PTSD. Since the events of the Lost Incident he has become withdrawn,reserved and closed of his heart from the world. As a child based on the picture of him and prior to getting kidnapped for Hanoi Project he appeared to be cheerful and outgoing.
When Jin was 6 years old along with Yusaku he was one of the 6 children kidnap for Hanoi Project.Despite having been rescued he is still suffuring from PTSD and closed his heart from the world.
Jin has been mentioned several times by Yusaku Fujiki and Shoichi Kusanagi during their fight against Hanoi.After Shoichi discovered the true identity of Blue Angel who is Yusaku's classmate and step sister of SOL Technologies Security Manager Akira Zaizen Shoichi suggests Yusaku to meet her so that he can get a lead on Akira regarding Jin as well as Yusaku's stolen memories but he doubted the plan would work due to Yusaku's poor social skills with women.
He was indirectly mentioned during Playmaker's duel against Revolver as the former vowed to Revolver that he would save him. While Yusaku and Shoichi were deleting the files of Playmaker that people post on the network, Yusaku wondered if it was wise to seek Revolver out for answers about Yusaku's past and about Jin.[8