You can try and provide me an example of a similar band based on themes and influences of aristocats, vampire, rose, undead, ann rice novels(mainly the characters and its own themes), light and darkness, french romance, prince and princesses, palaces, baroque,17th century society and in some instances christianity.
They are Versailles period.
Quite the contrary, I don't like plenty of power/melodic bands for their terrible vocals and concepts for their songs. I follow very few for these reason. I can only describe Versailles as Symphonic-heavy metal, I don't think they are fast enough to be power metal. I am not up to debate what sub-genre is what but simply stating Versailles is power metal is a gross understatement in what they bring to their music.
Vocals depends on an individuals taste in music. You trying to state Kamijo has bad vocals to me doesn't mean shit.
note: I don't consider growlers/screamo/cookie-monster vocals in the same category as Kamijo's style. They are very different and can only fit the metal they were intended for.