Name Game

I am orange and red, and sometimes even blue.

I can have almost any hue.

I eat anything that I touch,

And I can never eat too much.

I am brightest at night,

I never lose in a fight.

Except against one foe,

Who you all know.

I can be your best friend,

Or I can fight you to the end.

I can be as wild as a boar,

Or your friend forever more.

Without me your day would be spiteful,

And you nights frightful.

I am hotter than heat,

The hottest guy you will ever meet.

Who am I?