humans are dynamic beings, constantly changing and adapting to various situations. no one can be the exact same person when they go to sleep at night as they were when they woke up that morning.
but general personality traits should probably stay pretty stable from day to day. so if you're gonna be nice, then be nice. don't be nice for a day or two and then decide to switch it with an asshole card. i can't keep up.
consistency. that's all i ask for, really.