fiercely loyal 

(Adjective) To be loyal with ferocity. A friend who is on your side no matter what, ready to go to war with you and take on whatever obstacle life presents. She is a fighter and a faithful sidekick, through thick and thin.

Deb Bear is the most fiercely loyal friend EVER, she would do anything to protect and support her framily.

fiercely loyal by KB543 January 5, 2016

Fiercely Real

plus-size

Tyra: "I'm looking for some fiercely real models for next season!"

Fiercely Real by Unicornasaurus April 2, 2011

fiercely 

as if your life depended on it....
with every bit of strength within you...
to the very end....
deeply from the heart....
throwing it all on the line.....

"I loved him fiercely until my last breath....."

fiercely by genuinetears August 31, 2017

fiercely auburn 

describes a red-head whose hair is not bright enough to qualify him/her as a "ginger;" can also apply to red-heads refusing to admit that they are gingers.

I am NOT a ginger. I'm just fiercely auburn...

fiercely auburn by MacNCheese61 November 13, 2011