An editor where you can edit your general & units' experience, attack & defense?

[Trexmaster]

Is there?

[Ludens]

Is there?

There are 2 editors available for unit statistics (I assume that's what you mean with attack and defence): you can find links to them in the EDU guide (https://forums.totalwar.org/vb/showthread.php?88859-Guide-The-Complete-EDU-Guide-(WIP)). As for editing experience, I am not sure. There is a R:TW save game editor somewhere, but I am not sure you can edit units. Of course, if you only want to edit starting characters, you can do so via the campaign map features. I think Campaign map guide (https://forums.totalwar.org/vb/showthread.php?50437-Making-a-new-campaign-map) cover this.

Is this what you are looking for?

[Trexmaster]

Is this what you are looking for?

No, sadly.