I am a sister but I may not have any siblings. Who am I?

Answer: A nun

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More Who am I?

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I am hairy, a bit scary and oh so blue and I love to gobble on a round treat or two. Who am I?
I am round with four corners, I am freezing, I am boiling, at the same time. Who am I?
I am small, I have wings, I carry a weapon. I target people and once I do, they’re usually glad I did. Who am I?
I block the sun, I can keep you warm. Spell my name backwards and say it twice and you shall be on your way.
I can be scary, I can be entertaining, I cover my face so it will be impossible for you to recognize me and I create animals from plastic. Who am I?
I can be the father or I can be the son, we go by the same name. Hearing my name you might think I am related to a tree or a flower. And I was once a very important figure in the United States. Who am I?
I can help a minor, I can help a senior, I can take care of you and no matter what your mood is and I always give you a happy face. I probably won’t give you any advice, but I am always grateful when you give me tips. Who am I?
I can laugh, I can cry, I can be the flying hero in the sky, I can be the devil, I can be be a saint, I can do just about anything what you want me to be and I still get paid. Who am I?
I can shave everyday but my beard will stay. Who am I?
I can take parts of Africa, Egypt, Argentina and almost any part of the world in my hands and shove them into a box and move them all around. Who am I?
I can take the role of an electrician, a carpenter, a pipe lifter or a driver. I may even carry you, and if I do, you might just call me a hero. You can count on me any time of the day. Who am I?