Use :

Create a .txt file in your mirc dir with the name hi
Write the nick that you want to greet and the message.

ex:
Legolioum OmG ThE No HiStOrY NiCk
Gozaria Allura

This will return as :
[Legolioum] OmG ThE No HiStOrY NiCk
and
[Gozaria] Allura

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You can enter nicks and messages like that or use //write in the editbox

ex:
//write hi.txt Legolioum OmG ThE No HiStOrY NiCk

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You can use colors only for the message atm but there will be an update.

Updates coming
1.Dialog
2.Nick Color Change
3.Different Msg For Each Channel

on *:join:#:{ if ($read(hi.txt,sn,$nick,1)) { msg $chan $+(4[2,$nick,4]) $read(hi.txt,sn,$nick,1) } }