One way to do this would be:
I am sorry but i did not understand what i must do ?How can fix this ?
I 100% agree with Trigonomicon, but I will accept this piece using a loophole of a compilation of different characters, where each of them has their own palette, but all are connected by a style, not by the palette. It gets average 32 colours per character.
However, please remember that colour palette management is one of the quality markers in this gallery, and you should keep it as minimal as possible even when you do a compilation like this (you should try to recycle as many colours as you can, and unify very similar colours). If this would be a singular piece with over 800 colours, it would be deleted from the queue instantly.
You have a lot of redundant colors in this piece, and most of them are also slightly semi-transparent for some reason. It will have to be cleaned up a little before we can accept it into the gallery.
Image inspector
There's even penitent one ;) love it