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.
"Funny Aneurysm" Moment: The cover art was designed so that characters from manga that are currently running in some form would appear at the front. This unfortunately includes Beelzebub, which concluded before the game was officially released.
Les Yay: In the opening, when Lala gets pushed into Chitoge, she grabs onto her rather affectionately. Love Bubbles even start appearing around them! It doesn't help that Lala's tail is wrapping around Chitoge.
Scrappy Mechanic: In initial demos of the game, people were generally annoyed by the lengthy invincibility frames characters got after being knocked down. This was mostly fixed by the game's actual release, with the invincibility cut down by more than half.
Boa Hancock. Although she does play a big role in the story, her appearance surprised more than one fan as she's not a main character.
Portgas D. Ace, to some people. While he is an Ensemble Darkhorse, it's still surprising to see him playable over main characters like Zoro or Sanji.
Some people are also surprised that Jonathan and Joseph Joestar got in before Jotaro Kujo, who's considered the most iconic JoJo protagonist. This was likely due to their recent appearances in the 2012 anime, although Jotaro's and Dio's names have been found in the game's files, suggesting they either were Dummied Out or will be DLC later down the line.
Luckyman, a man from a rather obscure series based around his superpower of being lucky. He's only appeared in a game once before as an assist in Jump Ultimate Stars.