Design bold and aesthetic tweets that increase impressions and profile engagement.
Your display name appears beside every post you make, at the smallest size X uses, next to a plain @handle. That makes it the highest-use place for a style and the least forgiving of a bad one. Sans-serif bold reads as a stronger version of the same name. Small caps read as a considered choice. A short frame (lenticular brackets, a single star each side) fits within the 50-character cap without crowding. Script, blackletter and long wing frames are legible on the profile page but blur in the timeline. Whatever you pick, the @handle beside it stays plain and searchable, which is why the display name can afford to be styled.
The 160-character bio is read at profile size, where more styles are legible, and the usual structure is one styled line then plain text. A pinned post's first line is effectively part of the profile and is a good place for a bold or fullwidth headline. X does not offer formatting to standard accounts, so unicode styling is the only way to get bold or italic in a post at all. Character costs are one per styled letter; frames add their symbol count. None of it is searchable, so any name or term you want found should appear in plain text at least once in the bio.
50 characters, including styled letters and frame symbols. The @handle is separate, 15 ASCII characters, and cannot be styled.
Sans-serif bold or small caps, optionally with lenticular brackets. They stay readable at the small size X uses beside posts.
Only by replacing those characters with unicode bold. X has no formatting for standard accounts. The bold words will not be matched by search for the plain word.