Ink!Sans has a tendency to get too excited about things. He happens to sometimes randomly vomit ink, mostly when he gets too emotionally shaken, whether from passion or shock. He also has very short memory and will forget about different things - sometimes stopping mid-sentence to try and remember what he just said a few seconds before. This is why he takes notes on his scarf. Ink does not appear as a perfectly well-behaved character. He can be inconsiderate, or even downright mocking and cruel