I thought I'd do a Mary-Sue test of my Reaper High persona, Jacki
[ ] They are possessed by an angel
[ ] They are possessed by a demon
[ ] They are a werewolf/vampire/faerie
[ ] They are physically strong
[ ] They have a rare hair/fur colour
[ ] Their eyes are an unusual colour
[ ] This happens to be red
[X] Their eyes change colour (SPOILERS!)
[ ] They have wings
[X] They can grow extra body parts/shapeshift (SPOILERS! Not Yet... )
[ ] They are immortal
[ ] (if a female) they have large boobs
[ ] (if a male) they are very muscular
[ ] They are very attractive to the opposite gender
[ ] They are telekinetic/pyrokinetic/etc
[ ] They have sixth sense/can mind-read/etc
[ ] They have an object of some sort that gives them powers
[X] They have a special ability/power, but they don't know about it yet They were bestowed/cursed with these powers (more SPOILERS! It started when she was 9)
[ ] They are a healer
[ ] They are from a very rich/royal family
[ ] They don't know that they are from a very rich/royal background
[ ] They have lost one/both of their parents
[ ] They ran away from home
[ ] Their parents are cruel, uncaring, abusive etc.
[ ] They witnessed one/both of their parent's death
[ ] They are part angel/demon/faerie/some other mythical creature
[ ] They never knew their parents
[ ] They were abused/spoiled as a child
[ ] They are very attractive to the same gender
[X] They have lots of friends/no friends (No friends when she was little, and then made some as time went by)
[ ] They are emo/cutesy
[ ] They look much younger/older than they really are.
[ ] They are currently in a relationship
[ ] They have lots if morals and state them a fair bit for example: 'I would rather be with my friends than with my boyfriend/girlfriend' 'Nothing matters more to me than my friends/family' 'I wouldn't hesitate to die in place of a friend' etc. It's fine if your OC has these beliefs/values, but if they constantly say them out loud/preach them to others, then we have a problem.
[X] They have a mental disorder (Asperger's Syndrome and ADHD)
[ ] They have an emotional disorder
[ ] They struggle to stay sane
[ ] They are a psycho
[ ] They have multiple personalities
[ ] They are very intelligent
[ ] They have hallucinations
[ ] They can summon spirits/demons/angels etc.
[ ] They have an unusual/unrealistic pet
[X] They have a guardian spirit (Antic... sort of.)
[ ] They have a 'special type' of soul
[ ] Their soul is not the same as them
[X] They can talk to spirits/ghosts (Considering how some of Reaper High's students and staff consist of Ghosts, then yes.)
[X] Some part of their body glows (*SPOILERS!*)
[ ] They have a rare/unusual name
[ ] They were born on an important date, such as New Year's Eve, Midsummers Night, The Winter Solstace etc.
[ ] They have a twin/sibling that they were separated from at birth
[ ] They are connected with a certain element
[ ] They are connected with a certain animal
[ ] They always dress like a certain 'label'
[ ] They look quite a bit like a character from a popular anime/manga
[ ] They are a race/species that is discriminated against/misunderstood
[ ] They have a certain power that is misunderstood/feared
[ ] They live/lived on the streets at some point in their lives
[ ] They are hiding from someone/something
[ ] They have a rare blood type
[ ] They cry blood
[ ] Certain noises/smells/situations/etc make their powers activate/give them a nervous breakdown
[ ] They are from a different country to where they live
[ ] They are very mysterious/dark
[ ] They are very lively/happy
[ ] Their mood changes a lot/very quickly
[ ] They are very patient
[ ] They are from a long line of (insert profession/power here)
[X] They have a piece of jewelry/clothing that they always wear
[ ] They have amnesia
[ ] They have some sort of permanent medical condition
[ ] The have a curse upon them
[ ] They are involved in some sort of prophecy
[ ] They are 'the chosen one'
[ ] They have insomnia
5 and bellow
Your character may be a bit on the boring side. Of course, this does depend, but generally if they are scoring that low, it wouldn't hurt to 'spice them up' a bit ^^
6-15 - Balanced Character
If your OC scored around here, then they are probably quite a well-balanced and interesting character. Those scoring in the higher end of this category may be a bit too much though.
16-25 - Borderline Mary-Sue
We have a problem. You need to tone your character down. They are most likely a bit annoying to others, too.
26 - Oh dear. Do I really need to comment on this?