What happens when you have a
Purity Sue, and remove the Purity part? You get a
Neutrality Sue. This one, much like the
Anti-Sue, is not afraid to be flawed. In this case, however the distinction made is not that the character is trying to be flawed, but that any flaws are
Hand Waved by them being
neutral characters. But, here's the interesting part... this means they have license to do
anything. Want them to save a kitten from a tree? They can. Want them burn the tree in the very next moment? They can, with no contradiction of character.
In terms of personality, this trope usually is either
devoid of emotion, or varies from
deadpan to emotional to
outright unstable. The
Neutrality Sue basically thrives on being somewhere between extremes, and thus able to do everything in between.
The
Heroic Neutral, the
Nature Hero,
Badass Normal, and the
Red Mage are all good candidates, if they're taken
Up to Eleven, the
only one of their kind, and their effects
can't be suppressed or countered. Expect them to have
Power of the Void, a
Hand of Life/
Hand of Death, and
Yin Yang Bomb as their power. Usually the protagonist, since as a secondary character their power is usually downsized.
Related to the
Fixer Sue, a combination of
Purity Sue/
Villain Sue, and in some cases the
Sympathetic Sue (if backstory and personality flaws are played out heavily).
If the character is a
Yin Yang Master, but fits smoothly within the party, they are
probably another trope. If they affect the whole balance of the good and evil within the universe, or are the
only defender of nature, and without whom the universe suddenly and inexplicably collapses due to the natural laws being disordered, then they might be this trope.
No examples, please. This only defines the term.