docs: def lookup_char(self, char):
          """Return character information from datasets.
  
          Parameters
          ----------
          char : str
              character / string to lookup
  
          Returns
          -------
          :class:`sqlalchemy.orm.query.Query` :
              list of matches
          """
          Unihan = self.sql.base.classes.Unihan
          return self.sql.session.query(Unihan).filter_by(char=char)