To touch up on what Merri said, though (and I hope it's okay), it might be wise to kind of let other people know if you're making it canon or non-canon.
Person A might interact with Person B, but Person A might see it canon, and Person B might not. So at least in the end, at least Person A is aware that Person B won't actually be present in Person A's journal or whatever, because Person B doesn't want it to be canon.
Person A might interact with Person B, but Person A might see it canon, and Person B might not. So at least in the end, at least Person A is aware that Person B won't actually be present in Person A's journal or whatever, because Person B doesn't want it to be canon.