Hmm, truth be told, I enjoy being someone's sidekick.
I think this has to do with being the youngest of three daughters, and the nature of me and my sister's relationship growing up. She would take the lead and I would gladly follow, (in terms of activities).
Also, when in a romantic relationship, I also prefer to fulfill the sidekick role. When I am with someone I both love and feel entirely comfortable with, I enjoy the freedom that comes with "tagging along", so to speak.
Being a sidekick doesn't mean that you don't speak or constantly defer to your friend, it just means that you derive happiness in providing happiness to someone you love.
If I am with you, and I can make you more comfortable and happy, then I, in turn, become happy and more comfortable as well.
