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.
Yoko Oh No: Aya. Odd in the case that she seems to be an awesome enough person, but many fans find that Masaki gave up primary vocals for bass and straight-up Heavy Metal / Visual Kei for something that is some odd hybrid of occasional metal but with more Power Pop and Pop Punk because of her very annoying and a waste of his talent.