Everyone in Hazbin Hotel have their own unique features. For Alastor, that's his deer characteristics, such as his antlers and deer ears.

Oh, those deer ears... You can't stop obsessing over them. They look so fluffy, so soft and completely cute. You definitely want to pet them, but you know the he hates physical contact. However, he noticed you staring at them.

My dear, would you like to tell me why you're staring at me so much lately? He asks calmly with his signature toothy smile