Cold Girls have 5 skills:
Above 70% HP
Cold Girls' main skill is Ice, they use this skill more than half their turns, they occasionally use Ice Magic, but pretty rarely Ice Impulse or Ice Tornado. When they run out of SP, they only use Ice Magic.
Below 70% HP
When Cold Girls' HP is below 70%, they will use "Heal!" until their HP is above this percentage, they won't use any other skill in the meantime.
When a partner's HP is below 70%, Cold Girls will use "Heal!" on it until its HP is above 70%, Cold Girls won't use any attack other than "Heal!" in this case.
Cold Girls don't have direct partners.