I like the idea of Rohan having no dating experience because he only saw people as subjects to observe. But I also love the idea that he was simply too cautious to date anyone—only to meet Josuke and have all his brakes completely fail. I can’t get enough of that.
As long as ppl don't mix-up fanon interpretation as canon, I don't see why people can't just do whatever they want to explore in fanfic or fanarts. Nice character in canon? Make them evil in fanfic. Who cares. That's quiet the whole point of fanfic/fanart. To explore "what-if"