These websites generate random D&D characters for you using the core rules. Just click a few buttons and you are done. They are listed here in no particular order. They were sourced by the DMR Facebook group.
https://rpgtinker.com/bestiary.php (5E - by members of: City Army, Goblin Tribe, Monstrous Army, Pirate Ship)
https://docs.google.com/.../1uyre7jYpD1fQG4U9rqJd.../edit... (5E - Spreadsheet)
http://www.npcgenerator.com/ (generic - stats with potential plot hook)
http://orteil.dashnet.org/randomgen/?gen=0R1x7hyU (generic nobility - no stats)
http://www.dwarvenautomata.com/leveled-npc-generator/ (1E - leveled NPCs)
https://donjon.bin.sh/adnd/random/#type=npc (2E - stats, description, arms/armour)
https://donjon.bin.sh/adnd/random/#type=harlot (2E harlots)