@osuccess, @ofail, and @odrop messages may contain %-substitutions, which evaluate to gender-specific pronouns if the player's sex is set. They are:
%a | (absolute) | Name's, his, hers, its |
%s | (subjective) | Name, he, she, it |
%o | (objective) | Name, him, her, it |
%p | (possessive) | Name's, his, her, its |
%r | (reflexive) | Name, himself, herself, itself |
%n | (player's name) | Name |