the little mermaid … quick! you and your partner(s) have been turned into mythical/magical creatures of your choosing! what are you/they and why?

Vampires certainly fits the bill. Immortal. Beautiful, etc.

the ugly duckling … how do you cheer each other up when the other is feeling sad or having a bad day? is there a sort of routine you have in case things get real bad?

Buying one another sweets and snacks, and of course, threatening harm on the people who have wronged each other.