Kosame is one of Lisa's bodyguards who works alongside Hayate. She has a supporting role in the series, commonly assisting the young Lisa in several of her plots, though more often in assisting in her brother's plots. Kosame is a professional hitwoman, trained in several forms of martial arts as well as in marksmanship. She is a strict and professional woman who (aside from very few occasions) always wears her uniform and is always stoic and alert.