I don't mind character development, but I would rather they develop on interactions between characters in terms of brotherhood, teacher and student relationship, family ties (Sun WuKong's relationship w/ his monkey tribe, background story behind the monk, the dragon's prince story arch, etc), interaction w/ the heaven deities, etc. rather than have random love relationship between the main characters and random monsters. I don't want a sun wukong love story at all. The 80s didn't need it and to me it was the best adaption thus far.
I must say, I wouldn't mind if they expanded on the story of the water demon dude (3rd disciple) b/c his character is beyond dry. lol
Also, I want a good portrayal of the dragon prince who turned into a horse. I always get so giddy when he showed up in the 80s version.