Oliver and Pax didn't have any powers. Loki's three sons were conceived of his union with other gods or monsters.
Demigods are typically the offspring of a god and a mortal human, though the Norse pantheon of gods were known to mate with the jötunn and other species. The abilities
and weaknesses of demigods are generally unknown; certain demigods like those in the Norse pantheon showed off certain abilities and weakness to special wooden stakes, while the demigod Oliver merely inherited his father [[Prometheus]]'s curse and showed no other signs of godhood.