These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Sangatsu no Lion
Acceptable Professional Targets: A brief jab at Hayashida's salary as a teacher turns up in the same chapter as his first appearance; he correctly assumes that Rei's monthly salary and winnings as a professional shogi player is more than his, immediately irritating him when Rei doesn't deny it.
Angel/Devil Shipping: Rei/Kyoko, with Rei being the Angel and Kyoko as the Devil. While there are fans of the work that don't want this to happen precisely because of this dynamic, there are also fans that are excited by the prospect of it once the romantic undertones of their relationship become more overt.
Jerkass Woobie: While Kyoko's actions by no means should be tolerated, it's not hard for readers to see why she turned out that way and sympathize with her.
Mind Game Ship: Another way of looking at Rei and Kyoko's relationship, with the latter being the manipulator.
Moe: Almost all characters are prone to this perception, sure, but it's as if Momo purpose as a character extends little past being the primary source of the manga's cuteness.
Periphery Demographic: 3gatsu's target demographic is Seinen, but its soft art style and introspective look on life make it accessible to both genders and a wider age range.
The Scrappy: Kyoko, who, for the most part, is disliked by the fandom due to her treatment of Rei and her behavior in general.