The eyeball is called something like an...orbit? Use a monster editor to find it quickly. Oddly enough, I too haven't seen it in a lot of clients. When I had my server running, I brought it back though.
If you want to add a new npc completely, there's a link in the resources thread. Be careful though, as the npc editors/makers that come with servers (there are two primary ones, one is by sandurr) can mess up sometimes and cause all NPCs to disappear. Backup all important data.