In most circumstances, Senketsu is a composed and analytical individual, calmly observing and assessing situations as they occur. He maintains this level-headedness even in the heat of battle, thinking of attack strategies, giving Ryūko advice and warning her whenever she is about to run out of energy. He initially shows a manic and aggressive craving for Ryūko's blood, as he needs it to remain active, although this is satiated once she starts wearing him regularly.