Jan is King's little brother. Jan was kidnapped by Mr. Big's men during the time of Art of Fighting and King was forced to collaborate with Big, until Ryo Sakazaki defeated the man and freed both his sister Yuri and Jan from Big's hands. In the second title, he was caught in a traffic accident and lost the use of his legs. The cost of his operation was covered by Ryo and Robert Garcia.
In the KOF storyline, Jan gets really sick before The King of Fighters '96 tournament and is in the hospital. King entered the tournament, trying to win it so she can pay for his treatment. Unfortunately, King loses the tournament, but her teammates, Mai Shiranui and Kasumi Todoh collected enough money to treat Jan.
Jan is a good boy who loves his sister very much. He's also very outgoing, often hitting on King's friends. In some game endings, he shows a bit of a kinky side when he removes Yuri's bikini top in the beach.
- Art of Fighting 2 - during King's ending
- The King of Fighters '96 - in the Women Team ending
- The King of Fighters '97 - in the Women Team ending
- The King of Fighters '98 - during the credits
- The King of Fighters: Kyo - as a NPC
- Days of Memories (second title) - as a NPC
- The King of Fighters 2002 - background cameo, only in arcade versions
- The King of Fighters: Destiny - mentioned by King and Yuri in the Episode 6