天田 乾

Ken is a former member of the SEES and currently a student at Gekkoukan High School's middle school branch. Despite his young age, Ken is very intelligent and mature. He is honest, diligent, and deeply caring towards his peers, particularly the members of SEES. He is very polite to others, and never misses a chance to show respect where respect is due. Ken is shown to care for animals, such as Koromaru, who is also his best buddy in Persona 4 Ultimax.

Although he is very mature for his age, he likes to watch a children's show, Featherman R, but he prefers to keep it a secret. He seems to collect a lot of the Featherman R figurines, as well. Ken notes that one of the reasons he uses spears in battle is so that he'll be on even ground with an adult. He has a strong dislike towards milk, but he forces himself to drink it believes he believes it can make him become taller. Unfortunately, it seems he may be lactose-intolerant and it makes him sick.

His persona is Nemesis, the personification of divine justice and retribution in Greek mythology.