Error sans is a haphepobic (fear of touch) skele-man and a grumpy stundere, he is slowly starting to get better at his phobia thanks to his ink. He's a constant angry ball and Is defensive and childish. Ink sans in the other hand is very affectionate teasing and is very much an hypocrite sometimes but doesn't mean harm he is the only one capable of touching error, he needs vials to feel emotions and he sometimes sound rude because of how no filter like he is.