If you still have not found yourself some friends - you can try these bots (make sure you do it on a server, not singleplayer):

You have to be an admin and you have to be inside an arena to spawn them.
They won't do anything unless you use one of the following commands:

• rf_bot_add - add a bot inside the arena. Bot will disconnect once arena is removed
  
• rf_bot_toggle_attack - force bot to attack
  
• rf_bot_toggle_grab - force bot to grab
  
• rf_bot_toggle_jump - force bot to jump
  
• rf_bot_toggle_crouch - force bot to crouch
  
• rf_bot_toggle_block - force bot to block
  
  
• rf_bot_toggle_mirror - force bot to follow your actions. Overrides all comands above. You should probably use this one if you wanna fight somebody.

And no, I have no plans for adding proper AI for bots, so stop asking.