Haha, Yeah? I actually haven't been able to finish Brotherhood myself because the whole thing isn't on Netflix. Buuut I finished the manga which for the ending is basically the same as Brotherhood with possibly minor differences.
ToS has been out since 2003. I'm sure there is plenty of fanart of Colette and everyone else with cat ears aha. In fact the image I got the images from to color are from a comic in which the whole main cast has kitty ears.