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.
Base Breaker: Hibiki. Most readers find her annoying and clingy most especially her relationship with Fujimaru which is rushed. Others find her as a Mary Sue.
The Load: Haruka. After getting herself kidnapped by terrorists - twice - she decides to flee protective government custody and promptly gets infected with a deadly virus. Then she gets kidnapped again. If Japan had mountain lions, she'd probably find a way to get trapped by them.
The Woobie - Fujimaru's little sister, Haruka Takagi. She has kidney problems, her father is accused of being a murderer, her brother is butting heads with terrorists, she has kidney problems, and the cult likes to dick around with Fujimaru by kidnapping her on a regular basis. Did I mention her kidney problems?