The gallery policy of Megami Tensei Wiki outlines how gallery sections and pages should be formatted on the wiki.
General
Galleries are dedicated sections or pages that display images or videos about a particular subject in an organized manner. For most subjects, galleries are kept in a Gallery section near the bottom of the page, following the Nomenclature section and just before the Notes and/or References section.
Galleries use <gallery> tags to automatically sort files into an array of thumbnails. A Gallery section will look like:
==Gallery== <gallery> File name|Caption </gallery>
Files kept in a gallery do not need the File: prefix in their name to display, unlike other forms of linking files. Captions are optional, but are encouraged to briefly describe a file, namely by indicating what type of file it is (such as a sprite or artwork).
Galleries should only list files that are pertinent or related to the subject in some way. This can also include images that do not specifically focus on that subject, but still involve them. For example, an artwork of a group of characters can be added to each character's gallery.
Galleries can and should also include spoilery content.
Gallery Order
For subjects such as characters, demons, locations, etc., the gallery's content should be ordered in the same order as the main page's Appearances sections, which follow the wiki's media order guidelines. I.e. files should be ordered first by media type (the same order as the Appearances sections), followed by series order (if that subject has appeared in more than one series), and then by media title release order (by the Japanese release dates).
File types should also be sorted into a particular order: Cover (for games, manga, etc.), Artwork > Maps (for locations) > Models > Sprites > Screenshots > Videos.
Spoilery files should preferably be listed as the last item within the orders defined above. I.e. a spoilery screenshot should be the among the last screenshots listed.
Gallery Pages
If a subject's Gallery section becomes too long, it may need to be split into its own Gallery page for brevity. Gallery pages are prefaced with Gallery:, such as Gallery:Jack Frost, and are linked to within the subject's Gallery section.
Because Gallery pages exist in their own space, these galleries are permitted and encouraged to be further organized into dedicated sections by media type, series, and media title, following the media order as defined above. As a condensed example, Jack Frost's Gallery Page may be ordered as:
==Game Appearances== ===''Digital Devil Story: Megami Tensei II''=== ===''Shin Megami Tensei''=== ===''Shin Megami Tensei: Devil Summoner''=== ===''Megami Ibunroku Persona''=== ===''Jack Bros.''=== ==Manga Appearances== ===''Devil Summoner: Raidou Kuzunoha vs. Kodoku no Marebito''=== ===''Persona: Tsumi to Batsu''=== ==Other Appearances== (For files that do not pertain to any one media or are from non-Megami Tensei media.)
Each of those sub sections would have their own gallery tags.