ERMAH-CHRENEHFLERF
It depends on the situation
If the discussion is already a little childish, as in:
Person 1: "No I'm not"
Person 2: "Yes, you are"
Person 1: "No, I'm not"
Etc.
Then i'd stick with:
"[INSERT NAME WITH VOWELS] pls".
No comma, because I didn't even know there should be a comma, and since it originates from dolan, no comma is needed.
Though, am I finding myself in the middle of a discussion with professional grammar I'd say:
"[INSERT NAME WITH VOWELS], please".
With comma, because commas make you look like a genius, and maybe a '!' too.
Have I 'accidently' clicked on "The Dolan Thread", I'd go straight dolan with:
"[INSERT NAME WITHOUT VOWELS] pls".
Maybe some more s'es and l's.
Trying is the first step to success.