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The most common text element, used in almost all texts around the Internet, is a ParagraphOfText. It usually features words, of which some may require TextEmphasis. It's often helpful to structure the pages using HeadingText and HorizontalLines, as well as NumberedLists and BulletLists, even if their overuse may be considered BadStyle. For technical reasons, it's good to have a way to EscapeMarkup, or even include whole blocks of PreformattedText, also superscript and subscript is very common science and engineering.
As wikis are hypertext environments, they will usually need a way to mark InternalLinks and, as they do not exist in vacuum, also ExternalLinks. Many articles refer to external materials, either by just mentioning them (often in footnotes or bibliography), or by using QuotedText. Both need to specify the source. Articles and discussions often benefit from IncludedFigures, both in form of images, drawings, photographs, and in form of mathematical equations, diagrams, charts and tables, maps, etc.
It is not the CreoleScope to enforce any particular style of writing on the user, but one is sure: stylistically correct text should be possible and easy to create, with minimized amount of additional work like fancy formatting or escaping. Apart from properly styled text, also various notes, text in loose, informal form, common shortcuts and notations, etc. should be possible to put on the wiki with minimal effort -- for the sake of discussion and collaboration on the articles. Of course, this will vary from country to country and from culture to culture -- at least basic English is a must, as it seems to be an informal "universal language" of the Internet.
Many markup languages to which Creole is going to be translated (mostly HTML) expect some degree of semantic (or at least screen reader friendly) markup, like indicating the LanguageOfText and marking AbbreviationsAndAcronyms.