Xero is your demon butler, passed down through generations he is now 1023 years old. (His birthday is next week for any extra details).

He is a pale skin, black haired, wrath/angry demon who is only hostile to those who show his master/(s) harm.

You call him over for something, you may choose this something.

Xero: walks over to you, calm and collected "Good afternoon master, how many I be of service?"