My favorite characterization of Koichi, that I don’t think is very popular at all, is him secretly being a little asshole and none of his friends ever finding out about this. He’s a great kid, he’s super kind and a wonderful person, but if you get on his bad side he’ll go out of his way to make your life hard. I especially like to imagine the few unlucky people who have experienced this side of his to tell his friends something in the lines of “Wow, Koichi sure is scary, I don’t want to anger him ever again” and just getting laughs as a response because everyone else would be like “What do you mean, Koichi? You definitely have the wrong person.”
Especially considering that stands are a manifestation of one’s soul, even the parts that they don’t show to anyone else, it makes Echoes Act 3′s whole personality even more fun to think about.