So Kakyoin in the Narrator Speedwagon au with a flesh bud. He says the most random and cryptic shit and freaks everyone out.
Kakyoin: *names a person before they can even introduce themselves and rambles on about a lot of personal details of their lives no one should know*
or, alternatively
Dio: Kakyoin, tell me what the narrator is saying.
Kakyoin: he says he can’t wait for you to eat shit and die. He says you probably don’t remember him but he knows your sins and nothing but hell fire awaits you. Also he thinks you’re a horrible father and you owe several women child support
WJKHRGBVKJSEBFHJAWHRKJVGA E X A C TL Y
THAT'S EXACTLY IT
Kakyoin is just this weird fucking dude who terrifies the hell out of everybody because nobody can figure out what the FUCK is going on with him. They know it's not a Stand ability because Hierophant doesn't Do That Kind Of Shit, but the alternative option is he's just naturally like that without any Stand intervention so ???????
and honestly, I can absolutely see Speedwagon feeding into this. He wants to fuck with Dio as much as possible as some petty revenge since he can't directly interact with him now, so this is the best he's got. He never does anything to actively label Kakyoin a threat, and the boy is still very firmly under Dio's control, but he will always say the most obscure, terrifying shit that nobody can understand but it scares the hell out of most of the other minions