Raised characters for powers, footnotes and ordinal suffixes.
ˣ² ᵃⁿᵈ ¹ˢᵗ
x² and ¹st
x2 and 1ˢᵗ
Unicode has superscript digits, operators and most of the alphabet. The tool converts everything it can, so x2 gets an exponent and the letters in a sentence get raised. The ordinal mode raises just the suffix in 1st, 2nd, 3rd and 4th, and the digits only mode makes exponents without touching letters.
A few letters have no true superscript form, so they might look different or stay normal.
No. These are Unicode characters that happen to look like styled letters, so they paste into any app that accepts text, with no font installation. Because they are different characters from normal letters, search and screen readers may handle them differently.
Unicode has no standard superscript q, so a close substitute is used.
For simple exponents, yes. For serious equations use a math notation system such as LaTeX.