People with Wheels
The Old Guys- These guys are usually really good, and stick to the type of skating they like best, usually pools and bowls.
The Normal Skater- They are just at the park to skate, generally nice and will give skating advice, but keep to themselves for the most part.
The Few Girls/Women- They are usually very good, and just like the normal skater, are only there to skate
The Hipster- Hangs out, never skates, shows off his pristine board, and explains how good he is at skateboarding.
Cruster/Shirtless Guy- Very good and most likely a local. They generally do not speak, as they are concentrated on skating, but when they do it is not a good thing.
The Young Kid- There is always a young kid who is better than everyone, no one knows how he or she got that good, but watching a 8 year old skate well is impressive.
The Scooter- this is a growing aspect with young pre-teens. They generally do not have any skatepark etiquette.
The BMX'er- Depending on the park, could be really good. A lot of parks carry are built specifically for BMX and the riders go to those parks most of the time.
The Rollerblader- They are still out there? A rare sighting, basically extinct.
People without Wheels
The Parent- A parent of a younger skater is almost always around at certain parks. Some are nice and most are very protective of their child.
The Filmer/Photographer- Most know where to go and how to stay out of the way. A lot of times this could be friends taking taking turns shooting each other.
The group of guys or girls- There is always a group of teens who do not skate and sit on features, no one knows why they are at the park.