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: Hello! Project
Americans Hate Tingle: Western fans of H!P will sometimes declare that Coconuts Musume was the worst group ever in the history of Hello! Project, whereas everyone else cares just as much about Coconuts as they do any other defunct H!P group.
Base Breaker: Coconuts Musume is this for many western H!P fans. Mika and Ayaka are usually forgiven (the first being half Japanese and the latter fully Japanese), Danielle specifically gets the most flack despite not actually being the worst at speaking Japanese.
Ensemble Darkhorse: Chisato Okai was a Lesser Star in C-ute, but after uploading dance videos on YouTube, her popularity skyrocketed to the point where she's promoted to a main singer behing Maimi and Airi.
Fan Nickname: Nearly everyone. They also have fan ASCII faces.
The Scrappy: Michishige Sayumi was not well liked when she first joined Morning Musume, as her singing and dancing were decidedly sub-par and many found her narcissistic "cutest MM member" gimmick obnoxious. History would repeat itself a few years later, with the arrival of Kusumi Koharu. However, as both have grown as performers and eventually endeared themselves to a large portion of the fanbase, they can be said to have been Rescued from the Scrappy Heap; Sayumi won a lot of people over just by deliberately overplaying her Kawaiiko and It's All About Me tendencies to the point of comedy. That said, when discussing the single Resonant Blue, Sayumi lampshaded her role in the group: "I always get the 'Ah!' and 'Uh!' lines. I want to sing some actual Japanese words for a change!" Sure enough, come the single Onna ga Medatte Naze Ikenai, one of her (few) lines was an "Ah!".
Most recently, Mitsui Aika. Tsunku likes her though.
Shipping: Seems to revolve around 4th Generation member and resident Tomboy Yoshizawa Hitomi being paired up with more girly members like Ishikawa Rika and Ogawa Makoto. Though H!P Fandom does get passionate Die for Our Ship is never invoked and even Ship-to-Ship Combat is rare.
Yoshizawa and Ogawa playing rather Les Yay-ish romantic roles in Mr. Moonlight ~Ai no BIG BAND~ certainly didn't help... Though it should be noted that Yosshi is actually playing a male in the style of the Takarazuka Revue.
Nor did Yoshizawa and Ishikawa seeming to kiss one another full on the lips in the Ongaku Gatas video for Come Together.
They Changed It, Now It Sucks: Fans are naturally vocally upset whenever a member joins or leaves, which is very common. However, while the other main groups have a stable line-up, the biggest backlash of this occured with Morning Musume after the 9th generation's inclusion into the group and the subsequent departures of Ai Takahashi, Risa Niigaki, and Reina Tanaka, which left Sayumi Michishige as the only recognizable member for fans who have kept up with Morning Musume since 2002. Up-Front Works has even recognized Morning Musume's waning popularity and have made several attempts to market the group's changes as a rebirth, including rebranding the group as "Morning Musume '14."
Unfortunate Implications: C-ute was criticized in media headlines when they glorified Hitler in one of their show segments. There was also that one time where Eri Kamei and Reina Tanaka made a blog post with photos of them slanting their eyes, saying that they were imitating Koreans...
The Woobie: Iida Kaori and Yasuda Kei were pretty much The Chew Toy for the hosts of Utaban who actually Would Hit a Girl, especially Iida, although they never really hurt her (physically anyway), and it's always played for laughs.
Yaguchi Mari has a history of being mercilessly teased on shows like Utaban and HeyHeyHey!
Occasionally invoked for Kago Ai due to her going through a Break the Cutie.
Yoko Oh No: Often occurs whenever any of the girls are caught dating on tabloids. Of note, this was one of the reasons why Ai Kago was kicked out of Hello! Project. Fans also suspect this could have been the reason why Megumi Murakami and Kanna Arihara left C-ute, as both have been photographed with a boy before their departure from the group. Rumors say that when Arihara made tabloids dating Johnny's Jr. Ryosuke Hashimoto, many fans refused to shake her hand at C-ute's subsequent fanmeet.
Probably one of the stupidest fan reactions of this type happened when Sakura Oda and Kanon Suzuki spotted two boys — both dancers popular on Niconico, and both big H!P fans — in the crowd at Reina Tanaka's graduation concert and sounded excited about it. Immediately, fanboys cried foul and assumed that they were dating.