In order to update my previous thread about this issue, and since most required pages are already done, I'd like to inform about pages that will be "master pages" for all related pages under the same category.
Character: Ai Astin
Episodes: Valley of Death I
Light Novel: Kamisama no Inai Nichiyoubi Light Novel Volume 07
Manga: Kamisama no Inai Nichiyoubi Manga Volume 02
Character Infobox: Template:Infobox character
Episode Infobox: Template:Infobox episode
Single Infobox: Template:Infobox singles
Light Novel and Manga Infobox: Template:Infobox books
Stub Articles: Template:Stub
Spoiler Alert: Template:Warning Under Construction!
Anime: Anime and List of Episodes
Manga: Manga Under Construction!
Light Novel: Light Novel Under Construction!
Please refer to those pages while adding new pages to keep consistency between articles. Also, feel free to suggest more pages as master page if I missed them.