They usually come across as two women, though occasionally there will be a woman and a gay-presenting man. They're almost always white, but periodically one of them is Asian. About half the time they're in their 30s or so, and about half the time in their 50s. Sometimes there's one of each, but I think this might be a production glitch, as it's uncommon.
The two people stay and talk for a long time, as if they'd planned to do so, yet they never order their drinks in a "for-here" mug. They rarely order anything but a drink. They frequently also have a plastic cup of water in addition to their coffee-esque drink.
Their discussions are loud enough for everyone to hear pretty clearly, yet not quite reaching the level of annoyingly or inappropriately loud. The discussions span a variety of topics, but they're clearly rehearsed, and everything discussed is EXTREMELY IMPORTANT. There are never any "um"s or "hm"s, and absolutely no laughter. They speak with polished grammar, and always use a lot of adjectives and pop-psych words. The passive voice is used excessively. The discussions involve a lot of insights into people's feelings and motivations for doing things, as well as what is wrong with people and how this might be fixed. There's an early-adolescent-like amazement in their voices, as if they've JUST DISCOVERED that it's possible to have insight into why someone might do something. Also, they seem to have just discovered adjectives. Actually, most everything is an extremely new and exciting revelation, and the other person happily plays along. They'll talk about how they just discovered that you CAN ACTUALLY PAY YOUR BILLS by going ONLINE ON THE COMPUTER. Now, these always seem to be people of a great deal of education and privilege, but everything is NONETHELESS VERY SHINY AND NEW. Even a simple compliment just isn't so simple:
"I wanted to tell you that I REALLY LIKE that hat that you are WEARING. The textures and the COLORS are just so FLATTERING."
"Oh, it's so INTRIGUING that you MENTION that, because this HAT is one that was given to me by this NEIGHBOR, who really has this KNACK for knitting things, and I feel that it's very MEANINGFUL to have gotten a HAT from this NEIGHBOR, who gave me a HAT, particularly during this phase in my life when I've been laying the groundwork to address my naïveté."
"Well, it would appear to me that perhaps it is NOT actually knit, because if you'll LOOK, you'll see how there are these PATTERNS, which makes me wonder whether it's actually WOVEN, because sometimes clever people who are inclined to give hats to their close confidantes might actually take the initiative to WEAVE them."
"On second thought, it seems that perhaps you are RIGHT. Regardless, having received a HAT just further affirms to me that I am a good person, who deserves to have good things happen to me, such as being the recipient of a hat, whether woven or knitted. Now, at times when I've been wearing a hat, as well as at other times that I'm NOT wearing a hat, I'm beginning to realize that I'm starting to install this ABILITY to determine whether I can think POSITIVELY about a SITUATION."
Also, it bears mentioning that these people never come in, and they never leave. They're just there.