I have been toying with the idea of making a compilation, this is my list so far:
The Trader, stock market aficionado, have some impossible high goal, or just like human interaction, and their inventory is ever changing. Any pet they have can be acquired for the right price.
The Perma-Owner, any pet they purposefully get might as well be considered out of the game. They are never letting it go.
The Collector, similar to perma-owner, but will get as many of their chosen pet or theme as humanly possible. Secretly the reason why things become hard to find over time.
The Builder, found a game that never advertised itself to being about construction and proceeded to learn to be an artist. Skill varies but all deserve respect.
The Roleplayer, supposedly the original ones, a rare sight in the modern times in the game itself. More easy to find in forums and chats reminiscing.
The Literal Child, the target audience.
The Grown Ones, the ones probably funding the salary of the developers.
The Returning, lure by nostalgia, the ones who expect something familiar and, beyond the graphics, usually are left dumbfounded. Occasionally are rich and don't know it, yet.
The Grinder, they have a lot of something, lot of bucks, lot of age potions, lot of eggs, lot of current in-game pets. But most assuredly, lot of free time.
The Casual, sees a pet they like and play just enough to get it, then go back into the void.
The Event Participant, similar to casual, but for the big changes that transform the entire map. Deadly allergic to the color green.
The Neon/Mega Maker, they like the glow and are not afraid to work for it.
The One Who Can Use Robux, the unassuming heroes that keep the economy of the game flowing healthily.
The Developers, they say they play, fact not checked, but they definitely run around and spook people that is able to identify them. Guaranteed encounter of three specific ones during Saturdays.
The Naive, will believe what is being told, must be protected till they learn better.
The One Not Afraid To Check Value Sites, probably a PC user, doesn't actively look for trades, but will make sure that the random encounter is fair for both.
The Rich, for whatever reason they are at the top of the perceived economy, be it luck or hard work. Highly cynical of hearsays.
Obvious disclaimer is that these categories overlap, but what is the fun in saying nuanced stuff? Also I am aware of the dark side, like the scammer, botter, hacker, etc, but I don't want to talk about those.