Very few fish are ugly to me. Blennies in general are not my favorite, engineer gobies are pretty ugly, diamond gobies and copperbands are not my favorite either (the silver/orange combo doesn't sit right with me). Many of the large angels are fairly drab, and their terrible attitudes match. I can't stand either of the powder tangs, I know that's an unpopular opinion though.
Pink skunks are one of my favorite fish! They are incredibly tame for clowns, and the peachy color complements most anemones well. Normal ocellaris are not my favorite, the orange is way too bright and clown-like for me haha.
I am the exception when it comes to fish preference... I always prefer warm, muted colors as opposed to neons. If I want a bright color, I add a coral of that color.