Any contradictions that can't be resolved.
I feel like an outlier of "has Reality Warping in two stories" isn't the kind of thing that we usually actually discount as an outlier, especially for composite profiles. Composites get abilities that they've only shown once all the time, since they don't care about the consistent representation of a character's set of abilities, just about shoving them all into one page.
Extended Canon is anything that sits outside of Article/Original Canon. What is Article/Original Canon is explained on
this page, but in short, it's everything written by the author, everything that two authors canonically scale to each other, and everything in a canon/series/collaboration the character was written for. Everything outside of that is Extended Canon.