I suppose the biggest enemies depend on where I'm riding....
Around town it's dickheads in cages - I don't discriminate when I'm on the bike - I treat ALL cage drivers with contempt...
Out on the highway - same thing - just a whole lot faster
On back roads - same thing again but less room than on the highway, then add in Kangaroos, Wombats, Koalas, echidnas, sheep, cattle etc etc...
I suppose when I think about it, other than other motorcyclists, I have NO FRIENDS - just things that are going to try their best to kill me...