Acronym for Real Life Super Hero. People who use or personify the archtype of the comic book superhero and dress up like comic book characters of their own creation and fight crime, or otherwise actively seeks to help people or make the world a better place using the traditional comic book super hero as a basis for the general theme of their actions and interactions with the public when they attempt to do charitable acts or works of philanthropy within the limits of the law.
Some only do charity, some just help people. Others wear tactical body armor and patrol in high crime areas, using their social connections or training to help keep neighborhoods safe.
Mr Ravenblade is such a cool RLSH because he helps people and does charity work and patrols.