User blog comment:B214/Question and Answers 3/@comment-4547267-20140807065153/@comment-1359322-20140808015542

That's slightly inaccurate, not having honorifics when calling someone that is not your family either shows that they are close, they don't respect each other or either one of them is senior/more authoritative. For the first, it's more common to use the first name with honorifics which shows closeness, while for the second, it's like a person just calls that person without honorifics which is disrespectful if you are not close to each other. The third is usually like how a sempai talks to a kouhai, or a boss talking to an employee.

Anyway on to the topic, have you ever seen Rias use honorifics on any of her servants? No, that's because Rias is close to her servants, and also because she is their master, so she doesn't have to call them using any honorifics.

Also on the honorifics. There's "-kun", "-san", "-sama" and "-chan". "-san" is the most common one, it's like "Mr", "Ms" or "Mrs" in English but is gender neutral meaning it can be used for both genders. "-kun" is usually used to address classmates or senior addressing junior or boss talking to employees. "-kun" is less formal than "-san" and is usually used on males. I don't think i need to go into details for "-chan" and "-sama"