Mogai-Monarchs is a Tumblr
blog that has contributed a good amount to the MOGAI community. As of right now, the blog is run by six moderators, Mod Che, Mod Hader, Mod Shady, Mod Starry, Mod Mountain, or Mod Em, the first three of them being the original trio to start the blog. Since their creation, the blog has coined hundreds of genders and created flags for over many flagless terms.
The blog is also known for doing flag edits/redesigns, helping others find genders that fit them, and creating pronoun pride flags. The moderators are also open to helping others coin genders, making combinations of flags, giving headcanons for certain characters, helping others find pronouns, and doing pronoun validation.
As well as coining a number of terms, the moderators also reblog a number of terms (primarily genders) to their blog. Because of this and their expansive gender help posts, the blog is a fairly good resource for finding genders.
The blog is currently inactive with a message "Inactive - Don't Repost our terms or flags".