This puzzle is themed around the webcomic Homestuck. Twelve of the characters, the “beta trolls”, are associated with the zodiac signs. They also each have a particular “typing quirk”.
ARADIA MEGIDO (♈): Replaces o with 0.
TAVROS NITRAM (♉): Capitalizes all but the first letter.
SOLLUX CAPTOR (♊): Replaces “too/to/two” sounds with the digit 2, and doubles any instances of the letter I.
KARKAT VANTAS (♋): Capitalizes everything.
NEPETA LEIJON (♌): Replaces “ee” with “33”; makes cat puns with similar-sounding words.
KANAYA MARYAM (♍): Capitalizes the first letter of every word.
TEREZI PYROPE (♎): Capitalizes everything; replaces A, I, E with 4, 1, 3 repsectively.
VRISKA SERKET (♏): Replaces the letter B or “eight” sounds with the digit 8.
EQUIUS ZAHHAK (♐): Replaces “loo” sounds with 100, and the letter X with %.
GAMZEE MAKARA (♑): Alternates capitalisation.
ERIDAN AMPORA (♒): Doubles any instance of v or w.
FEFERI PEIXES (♓): Replaces H with “)(“ and E with “-E”; makes fish puns with similar-sounding words (or more generally, puns on any form of marine life).