If you still want to: Jonathan and Kakyoin
Jonathan is very fond of Kakyoin. Kakyoin’s definitely one of the least troublesome of the kids (…most of the time), and Jonathan appreciates how polite and helpful he is. And of course, he’s also really glad Jotaro has a friend, especially one who cares about him so much and is such a good kid.
Jonathan does wish Kakyoin would make more of an effort to socialize. Which of course, he feels that way about Jotaro too to an extent, but Jotaro has depression and anxiety and PTSD and all that fun stuff. Kakyoin’s only antisocial because he wants to be. Kakyoin very much has an attitude of “other people are stupid and annoying and why would I want to talk to them”, but Jonathan thinks there are probably more people Kakyoin could get along with than he thinks he does, and he wishes he would just try to make friends. Kakyoin has a small handful of online friends, but no IRL friends aside from Jotaro, and that worries Jonathan.
Kakyoin likes Jonathan, of course, how could he not? He appreciates how hard Jonathan works, but he thinks he needs to learn to relax a bit and not put so much stress on himself. He also thinks Jonathan is too much of a pushover/too forgiving and needs to stop taking so much shit. He’s said so a few times, but Jonathan of course is too sweet-natured to tell people no, so if it came to it Kakyoin would probably go behind Jonathan’s back to threaten people who give him trouble.