Aside from their physical and psychic abilities, the aliens had fleshy, wing shaped membranes on their back that could wrap around them and morph into the shape of humans as a disguise. This was not revealed until after the mission. Days later, the only surviving Shorty Alien barged into Kurono's school and massacred everyone in his class but Tae and Izumi. Luckily, Kurono had brought some of his Gantz equipment with him to the school and managed to eventually defeat the alien, by blowing up his head.