Who is Mr. Blade?

"Uncle Nick," Natasha called, walking over to him with a smile brimming on her face. She gave him a hug when she was close enough to him which he reciprocated. "How are you, Uncle?" She asked. He looks thinner than the last time that they saw each other.

"I am fine, my dear," he replied with a warm smile. "What brings you here today?" he asked as they walked into the kitchen where Aunt Shel was.

"I kissed you guys so I came to visit," she replied. Well, that was what she was doing now. She wanted to make sure they were alright and now that it was clear that they were not upset with her about anything, she was happy. The fact that they didn't seem to know at all that to a certain someone, was even better. All she prayed for now was that when she died, when all of this was over, they would be able to accept her death and move on. Live life as peaceful as this one right now.