Everything that is possible is probable, Individualogist Review meaning that it could happen. There are some limitations to that statement, and far too many to go into here but as far as hair color, the same elements that make up the earth, are distributed throughout the universe and since the body is made up of minerals of the earth, contributing to your physical appearance, if those necessary minerals that infuse hair with a brown coloration here, are present in different quantities there, then a blue tinge of color would be a possibility.
On some planets, these elements are just not available in necessary quantities for entities to form a valid reality system that would satisfy their purposes, but if there were, it might include beings that you would consider alien. There are no other "human like" beings in your solar system, but there are in your galaxy. There are other types of life in your solar system, but not what you would call intelligent beings of the human kind. Other aspects of you, probable selves, exist in many probable, parallel worlds, in your earthly neighborhood, and in one their skin has a blue tinge.
As far as "time" is concerned, time as you know it is not a universal attribute of alien systems. In fact, even on your planet, time as you think of it is only experienced by the human species. Animals, fish, birds and so forth, have no idea of time and were it forced on them, they would be totally confused. Time is also illusion, but it is necessary in physical systems of reality.
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