Regulars can either be some of the nicest people you have ever some of the most obnoxious.
Some regulars know exactly what they want, how they want it, how long it should take, and how they want you to mechanically respond to every little thing.It's frustrating and irritating and because they have expectations that have been set it's harder to get a decent tip.
Other regulars are friendly and forgiving. They understand that you can't make everything always happen exactly as they expect it. They are happy to just talk with you and build a relationship. And when they come in again, they'll call you by name and ask how your week is going, or how school is or why they haven't seen you around lately. They're the ones that make you feel appreciate and make you enjoy your job. It doesn't even matter if they're not the best tipper because they made you feel appreciated and like you matter and sometimes that's all we need.