When Orion was quiet, Lyra was loud. If Orion could be found napping in the Library, Lyra would be found toddling through the gardens, somehow unattended. If there was trouble, Lyra would discover it and Orion had taken his older-brother role very seriously. Much like Draco, the boy was fiercely protective of those that he loved and had come out of his shell quite nicely once his little sister was born. 