I don't really see what's wrong with that since they're idols. They're supposed to appeal to fans. I think it would be ludicrous to assume that the personalities we see actually match them 100% off stage. I'm sure even Miichan is a little bit different on stage and behind the scenes when there are not documentary cameras around. Developing a character (even if it's a fishing/sucking up character) is work imo. Yeah I do think Miichan and Yukirin get along and consider each other friendly colleagues, but it's not a deep friendship. At least that's the impression I get.