Rook Kast was intensely loyal to the Shadow Collective cause and Maul, personally coming to evacuate him on multiple occasions and showing concern for his safety as he faced Grievous on Zanbar. When Black Sun and the Pykes announced to Kast that they would no longer aid the Collective, Kast was quick to make the threat that she would go after them. Like many Mandalorian warriors, Rook is highly combative and merciless in battle. She shows little hesitation in using violence to achieve her goals.