If this were the entirety of Mnggal-Mnggal's existence, Mugg Fallow
would be an avoidable hazard. But the entity can infect other beings with
bits of itself, then eat at their insides until only shells remain. These puppets
appear normal at first glance, but closer inspection will reveal their vacant
gazes, stiff gaits, and (because they do not breathe or have a pulse) utter
stillness when at rest.
After consuming the innards of its prey, Mnggal-Mnggal fills every square
centimeter of the victim's torso, limbs, and head, and it can animate them
with sufficient precision to pilot an airspeeder, type on a datapad, or carry on
a conversation. Since such victims no longer possess lungs or vocal chords,
Mnggal-Mnggal projects its own "voice" from inside the throat, using speech
that is emotionally flat and possesses a buzzy distortion.
Bodies kept animated in this state are still corpses and subject to the
normal process of decay. After a week, a zombie of this type will begin to
rot, with the grayish essence of Mnggal-Mnggal leaking from the eyes,
nose, mouth, or ears.
...
Common throughout the Unknown Regions, Mnggal-Mnggal can be
placed on any world of the Gamemaster's choosing. Most likely, first encounters
occur through infected zombies, which might replace the residents of a
space depot, a contact the heroes are supposed to meet, or an old friend that
one of the characters will recognize from a previous encounter. Interactions
with these victims consistently feel "off," with distinctive signs that include
communicating without speaking, moving in choreographed patterns, and
speaking with unearthly voices. Some puppets might be partially decayed
and ooze gray fluid.
It is a certainty that such victims will try to infect the heroes by luring
them close enough to strike their faces with tendrils of ooze. Shooting or
cutting apart a zombie might cripple the host body but will only release
Mnggal-Mnggal in its raw form, which will be immune to similar attacks.
-Star Wars RPG: The Unknown Regions, Chapter IV: Hazards