Sienna was one of the White Fang's first advocates for using fear and violence to overcome Human prejudice towards the Faunus. She initiated this method, believing it necessary to make mankind regard them with fear to demand respect. Having personally created this change and becoming the leader of the White Fang, she was strong and willing to be violent, but not to the extent of hurting her cause on a global scale, which she believed the fall of Beacon had done. She was easily in touch with her anger but did not let it overrule her judgment. She let herself listen to Hazel Rainart briefly and also did not outright punish Adam for his misdeeds, she chose instead to lecture him. Her strength and independence were also notable after it became clear that Adam had committed a coup, intending to overthrow and replace her as High Leader. She stated quite clearly that she would not simply follow him, which was predictable enough in her character that Adam had already decided to kill her.