from The Century Dictionary and Cyclopedia
- n. One given to criticizing the actions and characters of other people; a gossip.
Sorry, no etymologies found.
It is in relation to the other three that we have to consider Dumas as a character-monger.
She was his pet, his dear love, his dear little Burney, his little character-monger.
She was emphatically what Johnson called her, a character-monger.
But an impeccable poet is not necessarily an impeccable plot - and character-monger either in tale-telling or in drama.)  Of this we have unusually strong evidence in the shape of MS.