They can be based on canon, fanon, or pure speculation: In essence, what the writer thinks or would like to think is true about that character/relationship. Missing scenes, personality quirks, childhood anecdotes, a character's thoughts on other characters, etc. It's all up to the author's imagination.
Leave a comment in this post to make a claim request. You can request as many claims at a time as you like, so long as you believe you can finish them fairly quickly. Up to four people can have the same claim at a time.
There is no strict time limit for completion of your claims, but I would ask that, if you have a character/group/pairing that is in high demand, please try to finish in no less than three months so that others may have the opportunity to use that claim.
If you would like to drop your claim, leave another reply in the request post stating so.
When posting your completed twenty facts, please use this format (or something similar):