this can be made possible?
You mean the program would display a character picture if there's no person picture? Sorry, it's not possible. Every time the program would stumble on an empty person picture (and it happens a lot), It'd have to download all the character pictures in hope that there's one (and it happens rarely). It would considerably slow down the program for very little benefit.
don't see it as a problem if character picture can fill person image if no person image found
It happens regularly that users contribute person pictures that are in fact character pictures, but I add them anyway because I understand that no better picture could be found. I hope it answers your question