As Hiro approaches the Street, he sees two young couples, probably using their parents' computers for a double date in the in the Metaverse, climbing down out of Port Zero, which is the local port of entry and monorail stop.
He is not seeing real people, of course. This is all a part of the moving illustration drawn by his computer according to specifications coming down the fiber-optic cable. The people are pieces of software called avatars. They are the audiovisual bodies that people use to communicate with each other in the Metaverse. Hiro's avatar is now on the Street, too, and if the couples coming off the monorail look over in his direction, they can see him, just as he's seeing them. They could strike up a conversation: Hiro in the U-Stor-It in L.A. and the four teenagers probably on a couch in a suburb of Chicago, each with their own laptop. But they probably won't talk to each other, any more than they would in Reality. These are nice kids, and they don't want to talk to a solitary crossbreed with a slick custom avatar who's packing a couple of swords.
You can look any way you want it to, up to the limitations of your equipment. If you're ugly, you can make your avatar  beautiful. If you've just gotten out of bed, your avatar can be wearing beautiful clothes and professionally applied makeup. You can look like a gorilla or a dragon or a giant talking penis in the Metaverse. Spend five minutes walking down the Street and you will see all of these.
Hiro's avatar just looks like Hiro, with the difference that no matter what Hiro is wearing in Reality, his avatar always wears a black leather kimono. Most hacker types don't go in for garish avatars, because they know that it takes a lot more sophistication to render a realistic human face than a talking penis. Kind of the way people who really know clothing can appreciate the fine details that separate a cheap gray wool suit from an expensive hand-tailored gray wool suit.You can't just materialize anywhere in the Metaverse, like Captain Kirk beaming down from on high. This would be confusing and irritating to the people around you. It would break the metaphor. Materializing out of nowhere (or vanishing back into Reality) is considered to be a private function best done in the confines of your own House. Most avatars nowadays are anatomiCally correct, and naked as a babe when they are first created, so in any case, you have to make yourself decent before you emerge onto the Street. Unless you're something intrinsically indecent and you don't care.
If you are some peon who does not own a House, for example, a person who is coming in from a public terminal, then you materialize in a Port. There are 256 Express Ports on the street, evenly spaced around its circumference at intervals of 256 kilometers. Each of these intervals is further subdivided 256 times with Local Ports, spaced exactly one kilometer apart (astute students of hacker semiotics will note the obsessive repetition of the number 256, which is 28 powerĐand even that 8 looks pretty juicy, dripping with 22 additional 2s). The Ports serve a function analogous to airports: This is where you drop into the Metaverse from somewhere else. Once you have materialized in a Port, you can walk down the Street or hop on the monorail or whatever.
The couples coming off the monorail can't afford to have custom avatars made and don't know how to write their own. They have to buy off-the-shelf avatars.