Delta!Sans is very serious, however, he is still very cocky (as Omega!Chara describes him).Delta!Sans can also get extremely emotional when Chara starts talking about Frisk and how Chara has gained complete control over Frisk's body. Delta!Sans is almost never seen to be joking around, and with the soul, he has absorbed, he has become braver. Unlike normal Sans, he is able to talk in a voice not his own. This is through the soul of bravery Delta!Sans has black liquid coming from his eyes.