Please check the User Rights Nominations to nominate or vote for potential candidates for these positions.
Bureaucrats
Bureaucrats not only hold all the rights and responsibilities of administrators, but also have the ability to promote and demote users to administrator. They can also promote another user to bureaucrat.
List of Bureaucrats
Sgt D Grif - Oversees various aspects including design, Mediawiki coding, chat, uploading, social media, and general operations.
Edits: Special:Editcount/Sgt D Grif
Administrators
In order to keep the RWBY Wiki working smoothly and looking nice, administrators have been given the tools to delete pages, rename images, protect pages, block users, and promote users to chat moderator. Administrators are automatically given chat moderator rights.
List of Administrators
ChishioKunrin - Oversees edits and maintains image galleries and images.
Edits: Special:Editcount/ChishioKunrin
General Esdeath - Oversees edits, chat, general operations, and community affairs, including social media.
Edits: Special:Editcount/General Esdeath
HazelQuill7445 - Oversees edits and maintains the Wiki to a higher standard.
Edits: Special:Editcount/ChishioKunrin
Lauren Darkmore - Oversees edits and keeps the peace on chat and mainspace.
Edits: Special:Editcount/Lauren Darkmore
Maki Kuronami - Oversees edits, governs the image galleries of the Wiki, and moderates mainspace threads and comments.
Edits: Special:Editcount/Maki Kuronami
Minomelo - Oversees edits and maintains the Wiki to the highest standard.
Edits: Special:Editcount/Minomelo
Rollbacks
Rollbacks possess the ability to "rollback" any undesirable edits for the Wiki with the push of a button. They function as moderators of the articles and between users.
List of Rollbacks
Argorrath
Edits: Special:Editcount/Argorrath
CreedKeeper25
Edits: Special:Editcount/CreedKeeper25
Darkcloud1111
Edits: Special:Editcount/Darkcloud1111
JadenLan
Edits: Special:Editcount/JadenLan
Lord Jaric
Edits: Special:Editcount/Lord Jaric
MiniDaggers
Edits: Special:Editcount/MiniDaggers
Phantomlink959
Edits: Special:Editcount/Phantomlink959
The Devil's Advocate WP
Edits: Special:Editcount/The Devil's Advocate WP
The Trumpet player of
Edits: Special:Editcount/The Trumpet player of
Discussion Moderators
Discussion moderators oversee the Forums, Article Comments, Blog Comments, and Message Walls to ensure that policies are followed and that incidents are dealt with promptly and appropriately. They can edit and close threads, edit and delete comments on articles and blogs, and delete messages from Message Walls. However, they do not have authority over the chatroom, and may not ban users from the chat.
List of Discussion Moderators
SpiritedDreaming 
Forum Edits: Special:Editcount/SpiritedDreaming/Board Thread
VedranTheII 
Forum Edits: Special:Editcount/VedranTheII/Board Thread
Chat Moderators
Chat moderators oversee chat to ensure that policies are followed and that incidents are dealt with promptly and appropriately. For more information, see the Chat Policies.
List of Chat Moderators
13th madman
Generally tends to be on from 8:00am to 12:00pm UTC.
Call me Nappa
Generally tends to be on from 1:00pm to 7:00am UTC on weekdays and 5:00pm to 7:00am on weekends.
Captain Barracuda
Generally tends to be on from 5:00pm to 10:00am UTC.
CreedKeeper25
Generally tends to be on from 11:00pm UTC.
Kamikaze839
He doesn't have a set time of presence. He is on and off sporadically throughout the day.
The Velvet Scarlatina
Generally tends to be on from 10:00pm UTC.