Well, that is a huge compliment, thank you! (I constantly feared my alterations of the canon could read as "far too Out of character, a trait I don't like at all at usual fanfictions) so I make a serious attempt to keep in tune and coherent to the original old canon, while I adapt my new characters to the established world and not the other way around
I think the only effecient way to insert a new character (fancharacters or oc's) into a canon established world is making them fitting to it, adaptig them to what personality, traits and history they'd likely have at said "world", and testing them through stories and art to feel and see if they do fit.
It's really flattering to know you enjoy the works I've done with skeksis, both canon and my own! I do my homework about ther backgrounds, history, traits and past, as well as try to keep them in-character (moreso with these fellows who have super-defined characteristics and personalities ^^ )
Thanks a lot for the positive review!