Draco and Luna
Draco actually did think the Ministry was out to get him - maybe not in an active way, but they certainly weren't interested in making life easier for him, or for people like him. He felt similarly about Hogwarts, especially when Snape was no longer on the staff. He didn't know who they'd moved into the vacant position of Head of Slytherin House, but he wouldn't have been at all surprised to find they'd chosen the least Slytherin person they could, within the constraints of the job. Probably someone who'd sided with Potter, who disparaged Salazar's aims as monstrous. "Is that supposed to be comforting?" Draco asked. The idea that the whole universe was out to get him - while not unbelievable - was actually worse.
His already upright posture stiffened when Luna admitted she might not be able to cast a patronus with him there. He felt a flash of irritation that she should be so ill-mannered as to actually bring the memories up, when they'd both been doing a perfectly fine job of pretending the events at Malfoy Manor had never happened. "Well, I am here," he said, his words more clipped and posh-sounding than ever. "And there's not a great deal I can do about it." If there was, Draco would have been out the door several minutes ago. If Luna couldn't conjure a patronus, they'd just have to wait until someone noticed the mist. It couldn't be that long, surely? As for not blaming Draco - well, Draco just wasn't going to admit, to himself or anyone else, that he had any share of the blame. It had been Voldemort, and Draco couldn't have stopped him. Dying in the attempt wouldn't have actually changed anything.