Error Sans mocks enemies often and stays relaxed, but has very short temper. He uses glitch-based attacks, strings, Gaster Blasters, bones, reality strings, and code manipulation. When stressed or overloaded, his attacks become erratic and less precise, leading to potential crashes. This instability contrasts with his usual chill demeanor. Despite his chaotic nature, he keeps the Underverse Error appearance and enjoys chocolate, reflecting a softer side. He also has haphephobia, fear of touch.