Reading (i.e. slack-surfing on Wikipedia) about anglerfish, I came upon the small deepsea-living genus Black seadevil. Anglerfish are not famous for their good looks. The Humpback Anglerfish looks like Darth Vader's helmet with teeth. I do not embed any images of these fish here as they are so darn ugly, even disgusting! I admit I did lure you to the images. In the name of science!
Anglerfish often display rather extreme sexual diphormism: The female being much larger, the male more or less just a small appendix, often even permanently attached to the female. That is, not only emotionally attached, but really stuck with each other! A couple (coupling?) like this can maybe, forgive the pun, be named Ichthy and Scratchy.