Zarkun said
The weaknesses and abilities should also not be 500 words. The reason I say this is because the abilities are only in need of a brief overview that gives you an idea of what it does and the weaknesses...well, why do I need five hundred words for "Bill has ADHD" or something like that. Or "Bill is illiterate." Get de idea?
Because of specificity.
Example:
Bill has ADHD. For most humans with ADHD, they are debilitated by the lack of ability to focus for long periods of time. Many humans on Earth have access to ADHD medications, which helps them alleviate the symptoms. And most humans too are not in an environment where they have to rely on their abilities to focus in order to survive. In the Island of Murder however, a split-second loss of focus while fighting can cause defeat.
When Bill fights in the wild, he's at a great disadvantage, because if a gnomish blue gorilla walks by, he would drop his gun and be like, "Ooooohhh!! I should catch that and ask him if I'll ever get married again!" And of course, the enemy will take that free opportunity to violate poor little Bill in the ass.
His ADHD extends to his social life, and when talking to a beautiful woman, he can't keep his eye-contact in the same place for more than ten seconds.
Blah blah blah, etcetera etcetera, and so on and so forth...
I want the characters to have specific, detailed, well-thought out strengths and weaknesses. Plus, writing 500-words articulately, even if it's just gobbledygook, shows willingness to put effort, and that's a sign that they can be devoted to the RP.