Who is your “Magical Mystery Tour” guide, metaphorically?

Who is your metaphorical ”Magical Mystery Tour” guide, the person that can take you on a wonderful rollercoaster of the mind or something equal to it; but not limited to that? The person that thinking of them is like a breath of fresh air. For this question it is a person you know and can share the same physical space even if they do not know you, such as a coworker, fellow student, resident of your apartment building, etc.