Companion - a person to accompany, assist, or live with another in the capacity of a helpful friend!!!
Well, these are my current companions ...
a) My Cell phone!!!
b) My pocket!!!
This line summarizes it all - My companion and I were alone with the stars: the misty river of the Milky Way flowing across the sky, the patterns of the constellations standing out bright and clear, a blazing planet low on the horizon. ( Courtesy - Rachel Carson )