Just a Dora The Explorer is a factual representation of the world of Dora The Explorer.
And would be a perfectly factual source for someone trying to figure out what Dora The Explorer would do. Yes. You're getting it.
By your definition a fact can be literally anything and of any relative value.
No, I'm saying that people usually say "what would Jesus do" as shorthand for "what would Jesus, as depicted in the Bible, do, based on these depictions".
a pointless distinction unless we're talking about a comparison to reality.
And what is that? Was Jesus a real person who's life Evangeliums record or an entirely fictional character? Luckily, we don't need to know this in order to answer the question "what would Jesus do?" We can simply assume a place, called "the world of Bible", and assume everything we know about the guy is true there. The price of this unified treatment for two mutually exclusive worlds is that the concept of "fact" becomes more complex with the addition of context: in which worlds is the fact true?
Not that you can avoid that complexity, since the very concept of imagining is really just a process of making these alternative worlds with different sets of true facts.