alias owner { return $nick(#,$iif($1,$1,$me),~) }
alias admin { return $nick(#,$iif($1,$1,$me),&) }
alias op { return $nick(#,$iif($1,$1,$me),o) }
alias halfop { return $nick(#,$iif($1,$1,$me),h) }
alias voice { return $nick(#,$iif($1,$1,$me),v) }

The $iif $true $false not really needed if you're only
going to use it as in your example. You would only
really need the $true $false returned if you wanted
to echo out or msg or by whatever means see the words
$true or $false. If so then do as follows:

alias owner { return $iif($nick(#,$iif($1,$1,$me),~),$true,$false) }
alias admin { return $iif($nick(#,$iif($1,$1,$me),&),$true,$false) }
alias op { return $iif($nick(#,$iif($1,$1,$me),o),$true,$false) }
alias halfop { return $iif($nick(#,$iif($1,$1,$me),h),$true,$false) }
alias voice { return $iif($nick(#,$iif($1,$1,$me),v),$true,$false) }