Initially, Fox didn’t have the rights to use Negasonic Teenage Warhead in Deadpool. Thankfully, they found a way to get a hold of the character, because Marvel wanted to use Ego the Living Planet, who Fox had the rights to, in Guardians of the Galaxy Vol. 2, so they traded characters. Brianna Hildebrand took an obscure character from the comics and turned her into a mainstream icon. What makes her such a joy is that she doesn’t take any crap from Deadpool, and will bite back when he makes fun of her. That doesn’t stop him, though. In the first movie, he hilariously compares her to Sinead O’Connor.