I have to thank Kita Mikichi for recommending this title, it's one of the funniest I've seen for a while.
So let's look at the characters, all the mains plus three side characters.

Starting with Nozaki, he's the complete opposite of how you would picture a shojo mangaka, completely deadpan with a clueless streak yet somehow manages to pull off a romance title.
Chiyo I wasn't expecting to be top tier shojo protagonist but at least she's interesting.
Mikoshiba reminds me a little too much of some of my friends but I like my friends and I like him, strangely relatable as well.
Seo is basically a guy, I know she isn't but she has the head strong attitude of most male protagonists, the nice singing voice is a nice touch.
Kashima's dub voice is horribly miscast, I'm trying to wonder what she's trying to achieve by acting the prince, I'm guessing she wants Senpai to notice.
Speaking of Senpai, Hori is basically Kashima's Dad, it's a dynamic that can only really work for those two characters.
Wakamatsu is probably the point where there shouldn't have been anymore main characters, while the others have good chemistry with at least one or two characters, Wakamatsu's design seems a little lethargic and his interaction with Seo while funny, is really cringy.
Miyamae is the reliable one to Maeno's incompetence, not much else.
Maeno I sadly know a few like him, the type that takes all the credit despite contributing nothing yet acts like he's doing nothing wrong.
Miyako is just oblivious to what Maeno is like, there be nothing but air in her head.

Umetarou Nozaki - 9.2/10
Chiyo Sakura - 7.7/10
Mikoto Mikoshiba - 9.4/10
Yuzuki Seo - 8.4/10
Yuu Kashima - 7.7/10
Masayuki Hori - 8.2/10
Hirotaka Wakamatsu - 5.6/10
Ken Miyamae - 6.0/10
Mitsuya Maeno - 4.5/10
Yukari Miyako - 4.5/10