mini person
A person that is extraordinarily small in size compared to their surroundings. Their small stature could be established against a humongous environment, or with normal sized characters.
Please note that a character that is visibly a doll is not to be tagged with this as they are naturally supposed to be smaller than the average human character.
If you can distinguish the gender of the small person, tag them as minigirl or miniboy.
See also
The following tags implicate this tag: miniboy and minigirl (learn more).