So I am one of those people who really didn’t care for the 1st birthday present.
However there is no point in trying to change the past so on to next year! Instead of something like a useless and bland mini Jennah how about a “Mini Me”?
The way it would work is that it would create a miniaturized version of you at the time of use. Most of the code for that should already be in the game. Cloning from mesmer and there is are mushrooms in Caledon that will shrink you. Additional possibilities could include working while transformed, giving additional purpose to the various tonics(probably not when you are transformed into furniture or a tree).