well not as a villain, but I'd love to see Nessie' use her silver swan powers to good use one day.
and didn't byrne try to tie diana to the 4th world already? I love the fourth world and consider it to be one of the best comics period, but they need to be apart. It's like revealing that everything in the universe has something to do with the emotional spectrum for Green Lantern...... oh woops! Seriously though they can have crossovers but I don't want them in the exact same mythology as the exact same part of the mythology.