Attached a quick fix for this bug (i.e. you'll be able to start a new game with the character sprite visible).
Download, decompress and replace the "Actors.json" file in the "www\data" sub-folder of the game.
DO BACKUP the original file first.
Actually all you need to do is go into the folder: www -> img -> characters
Copy the file name "1.rpgmvp" and rename the copy to "actor1.rpgmvp".
Then you can play the game normally.
Leave the file copy "actor1.rpgmvp" there just in case the game looks for a file named like that at some point - like with the preinstalled save file.
Reason:
There are files named "actor2.rpgmvp" and "actor3.rpgmvp" but no "actor1.rpgmvp" in the folder "characters".
However there is a file simply named "1.rpgmvp".
I found that strange.
So I copied it and renamed the file.
Conclusion:
That file "1" contains the MC sprite and the game does not display it because it looks for a file named "actor1".