“Despite his young age, Ken is very intelligent and mature. It is shown that this is a coping mechanism due to the death of his mother at a young age, which more-or-less forced him to give up his childhood. His maturity is noted by Yukari, who can't believe he's in elementary school and claims that Junpei, who is a full six years older than him, could learn a thing or two from him. Fuuka also notes his maturity, and finds him cute as a result of it. Besides being mature, Ken also says several words that boys his age don't usually use, such as "bastard," which he usually uses when referring to Strega.”

“Although especially idealistic, his tragedy with his mother's death torments him in maintaining his sense of justice and the reason to live it belies for him: at first, he considers suicide, but eventually forgoes that and responds with a drive for revenge.”

Voice Example

https://youtu.be/nOd-fMl1CvY?si=G2AHc-vbW4XlEpkb