Sutton-kyou is humanoid gentleman Yo-kai. He has yellow hair and a yellow mustache, and wears a white tuxedo outfit with matching white top hat. He carries a cane in his right hand.
In the games he has the ability to make people act weird and out of tune, while in the anime he has the ability to let people make weird noises specifically.
In the games, Sutton-kyou is described as a fellow who acts weird and out of tune himself, but is also completely oblivious to this.
In contrast, in the anime Sutton-kyou normally behaves very classy and gentlemanly, nearly always keeping his calm and collected composure. However, in the rare moments where he does lose it, he will be rendered completely petrified from the shock, to the point of actually dying from it as a human. He is also shown to have a sadistic side, clearly getting a form of enjoyment out of making people suffer from making high-pitched shrieks the same way he was made to.
Yo-kai Watch Animation Series
Sutton-kyou appears in EP175, in which he causes Nate to involuntarily make awkward, high-pitched shrieks.
Upon being confronted, he reveals his backstory. When he was alive, he was an English noblesman, named Lord Charleston, who considered himself "the most collected man in all of England". This caused his romantic partner to frequently play tricks on him, to try and make him lose his composure. After many unsuccessful tries, she revealed to him that she was starting a relationship with another man, causing Charleston to shriek out, and then die from the shock.
While Whisper and Nate are saddened by his story, Sutton-kyou uses this opportunity to inspirit the latter, which causes him to summon Jibanyan, who is inspirited as well. He leaves them behind, possibly to a fate of making high-pitched shrieks forever, thefore both of them decide to settle the score and enlist several Yo-kai to make Sutton-kyou let out a shriek himself while visiting a café.
However, he never truly loses his composure and confronts Nate, Whisper, and Jibanyan, who seemingly feel regret, until they reveal that their faces are blank -thanks to Faysoff's powers- which causes Sutton-kyou to shriek from the shock, breaking his inspiriting effect on them. Strangely enough, his medal then emerges from his unconcious body.
Yo-kai Watch 3
Sutton-kyou can be found in Hazeltine Mansion's library.
"Sutton-kyou" is a pun on the phrase "suttonkyō" (Japanese: 素っ頓狂 "out of tune", "harum-scarum", "pell-mell", "really weird") and the term "Kyō" (Japanese: 卿 "Lord" or "Sir"). His anime portrayal also suggests a connection to "suttonkyōna koe" (Japanese: 素っ頓狂な声 refers to akward high-pitched noises people may make when startled).