Cyrus Rose
Cyrus Rose is the very happy and loving step-father of Blair. He married her mother Eleanor Waldorf in season 2 and after Blair tormenting him for a while, she eventually learned to love him. Cyrus has a son that briefly dated Serena. Cyrus makes Eleanor happy and they are still married today. In Blair's wedding to Louis, she asked Cyrus to walk her down the aisle with her father.