This is an extremely simple blacklist I whipped up in a few minutes. It may not be the most feature rich but it certainly works.
To get started load into remotes. Once done click over to the variables tab and create a %nicks variable. Anytime you wish to add someone you will go to this variable and append the nick to the end.

Included for convenience is the /bl.nicks command. To list the current blacklisted nicks.

Alternate method of adding nicks would be using the /bl.nicks command. Copying its return. and doing a /set %nicks

on *:join:#:{
  if ($nick isin %nicks) && ($me isop $chan) {
    mode $chan +b $address($nick,2))
    kick $chan $nick Bye[Auto-KB]
    window @JBL
    aline @JBL 4,0 $nick has attempted to join1 $chan $+ 4,0. They have been banned and kicked.
  }
}

alias bl-nicks {
  echo -a %nicks
}