A nice young girl Superboy has been friends with since his very brief period in which he tried to go to school.

  Superboy met Hillary at Illupani High School when Mack Harlin forced him to get an education the same as everyone else. Hillary and Robert Lai (another school chum), were Superboy's closest friends. Hillary has a slight crush on Superboy, but she's never let it interfere with their friendship.

  Time and again Hillary has proven her loyalty to Superboy. When Superboy was expelled from school, Hillary stayed close friends with him. When Superboy was sick with the Meltdown virus the Agenda implanted in him, Hillary looked after his dog Krypto until she knew he was okay. She does on occasion hang out at the compound to visit her close friend, while socializing and remaining on good terms with everyone else there as well. She is the current keeper of Krypto and has been since the period when Superboy was an agent of Cadmus.