I recently saw a script here that would simply mimic anything said, so I made my own where you could choose who you want it to mimic. This script is meant for a bot. It will copy their words and actions.

Updates:
Fixed a really stupid mistake where the timer was 0 1 instead of 1 0
Made it so that it will continue to mimic someone if they switch nicknames
Fixed a small bug saying it was already off when you say ~mimic off

Commands:
~mimic on - turns it on
~mimic (nick) - makes it mimic a nick
~mimic off - turns the entire script off, it will stop mimicking people
~mimicoff (nick) - will make it stop mimicking only that person

On *:LOAD: {
  set %mimic.on false
}

On *:TEXT:~mimic *:#: {
  if (%mimic.on = true) {
    if ($2 != on) && ($2 != off) {
      set %mimic. [ $+ [ $2 ] ] on
      msg $chan $2 has been added to the mimic list
    }
    if ($2 == off) {
      unset %mimic.*
      set %mimic.on false
      halt
    }
    if ($2 == on) {
      msg $chan Mimic is already on.
    }
  }
  if (%mimic.on = false) {
    if ($2 == on) {
      set %mimic.on true
      msg $chan Mimic has been turned on.
    }
    if ($2 == off) {
      msg $chan Mimic is already off.
    } 
    if ($2 != on) && ($2 != off) {
      msg $chan Mimic is off. Type ~mimic on to turn it on.
    }
  }
}
ON *:TEXT:~mimicoff *:#: {
  if (%mimic. [ $+ [ $2 ] ] == on) {
    unset %mimic. [ $+ [ $2 ] ]
    msg $chan I will no longer mimic $2 $+ .
    halt
  }
  if (!%mimic. [ $+ [ $2 ] ]) { 
    msg $chan I wasn't even mimicking them!
  }
}
On *:TEXT:*:#: {
  if (%mimic. [ $+ [ $nick ] ] == on) && ($left($1,1) != ~) {
    timerMimic 1 0 msg $chan $replace($1-,$me,$nick)
  }
}
On *:Action:*:#: {
  if (%mimic. [ $+ [ $nick ] ] == on) && ($left($1,1) != ~) {
    timerMimic 1 0 describe $chan $replace($1-,$me,$nick)
  }
}
On *:NICK: {
  if (%mimic. [ $+ [ $nick ] ] == on) {
    set %mimic. [ $+ [ $newnick ] ] on
    unset %mimic. [ $+ [ $nick ] ]
  }
}