Hello. Working on my first script ever. :D
Anywho, I'm considering putting an invisible person in my stage play. I'd like to give him/her lines and have only one person be able to see him/her.

Could this possibly work? Or would it work better as a duo personality within a character?

Help. ;-;

I did this with last year's Screnzy - one of my characters could only be seen and heard by one of the others. I just wrote her lines the same way I did everyone else's, only I made it clear (in the lines and in some stage directions) that no one else could hear her or see her.

If your other characters can hear the invisible one, it'd be very simple to have them say things about the disembodied voice. The audience will figure out pretty quickly that no one can see the invisible one, except the one character (who will react to his/her actions as well as his/her words).
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NaNo 2006: Steel Bars - won at 59,233 words

I wrote a stageplay for my Writing class that involved four characters representing aspects of another character's personality. They followed him around talking among themselves, and were technically "invisible" to everyone else (even the main character, in a way). All I did was write their lines as normal, and let the dialogue reveal that they were invisible. So yes, it can be done. :)

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NaNo 06 - The Game - Won
NaNo 07 - Destination: Beautiful - Failed miserably

SF 08 - Untitled - TV script - 0% completed

I read the script to the play/movie Harvey. If you don't know what the movie is about go watch it now. One of the main characters was a 6'3" white rabit named Harvey. He was invisible and only one character, Edward P. Dowd, could see him.

Harvey never had any spoken lines but he does say things. Harvey's lines are said by the Edward. When ever Harvey and Edward leave a room and have to shut a door Edward is polite and lets Harvey go first taking care of that problem.

I would say that it most definatly can work.

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I was in the park, wondering why frisbees get bigger and bigger as they get closer. Then it hit me.