I really find it strange to hear people seriously discussing the influence of hair color on the outcome of a fight.
If you shave your head bald, it really helps, then your rival won't be able to grab your hair

I can say that the advantage in weight and strength is not always the decisive factor in a fight. I will not give examples of martial arts, where experience and knowledge of technique can bring victory over a physically stronger opponent. I'll tell you about my cousin.
Her name is Marina. She's 5 feet 5 inches tall, quite slender—I'd even call her skinny—but she has beautiful breasts. She has dark hair and dark gray eyes. She never played sports, but she never lost a fight. Before she got married and settled down, she fought a lot. These were real girl fights, with nails and hair pulling. She didn't win every fight; some had controversial outcomes, and others were left unfinished because the combatants were pulled apart. But she never lost. Even when her opponent was on top, Marina didn't give in, she never gave in. Her eyes remained dry, and her nails tore at her rival's face. She won thanks to her iron will. It was her strong character that allowed her to endure pain and withstand blows. (Although, perhaps it was because she was born under the sign of Scorpio

)
I myself saw how bigger and stronger girls would burst into tears when she dug her nails into their faces. There were no rules in such fights. The girls would punch and kick each other, pull hair, scratch and pinch, roll on the ground and bite. And in such fights, Marina was a true queen.