Pick a couple who remind you of you and your OH (the people you pick need not be together - you could be Yoda and your OH Jennifer Anniston, but couples could be fun e.g.Donkey and Dragon from Shrek): tv, film, animation, gaming, celebs... etc
Single? Pick your alter ego...
Just pick someone who reminds you of you in some way. If you want to expand and explain your choice, that could be fun too...
An older Clint Eastwood ( I saw some pics taken last October, and the likeness is uncanny, if only i`d looked like him as a younger man!) and Davina McCall/Gillian Anderson.