A fancy text style is only useful when it covers the characters in the message. Unicode was not designed as a collection of social-media fonts. Its styled alphabets were added for mathematical notation, phonetics, enclosed labels, compatibility with older standards, and many other technical purposes. Coverage therefore varies by block.
Mathematical alphabets are the most complete. Bold, italic, bold italic, script, fraktur, double-struck, sans-serif, and monospace sets cover most basic Latin uppercase and lowercase letters. Several include matching digits, but not every alphabet has its own numerals. A generator must preserve an ordinary digit when no honest styled equivalent exists.
Superscript and subscript are incomplete by design. These characters were introduced as needed for phonetics, formulas, abbreviations, and compatibility. Superscript has broader lowercase and numeral coverage than subscript, but neither is a complete parallel alphabet. Mixed output is expected when a letter has no assigned codepoint.
Enclosed sets follow their own rules. Circled letters have broad Latin and numeral coverage. Parenthesized letters focus on lowercase characters, while squared symbols are often capital-only. Converting lowercase input to an enclosed capital may create a consistent look, but it is a design choice rather than a literal lowercase mapping.
Accents and non-English letters need special care. A precomposed character such as รฉ does not automatically inherit the style of e. Some systems can combine a styled base letter with an accent mark, but visual alignment varies. Names and multilingual text should be checked character by character instead of assuming complete Latin-script coverage.
Punctuation usually passes through unchanged. Mathematical alphabets do not provide matching commas, apostrophes, or most symbols. Ordinary punctuation is often the most readable choice. Decorative frames and dividers are separate characters added around or between the converted letters.
Before choosing a style, list the required character types: uppercase, lowercase, digits, accents, punctuation, and symbols. Test the hardest characters first. A slightly simpler style with complete coverage will look more intentional than an ornate alphabet that falls back in the middle of a name.