1. Gosh, I love crossovers. Plucking a character from their natural setting and plunking them elsewhere that's not so natural. I dream of a day when Dr. Gregory House vacations in Miami and gets involved with the Miami Metro and a certain blood spatter analyst. Dexter's mental commentary on House's witticisms... I can imagine it now <3 <3 <3 House on Dexter would be super-duper! Dexter on House? Not so much.
2. Tattoos are great! Nearly all of my characters have tattoos. The one's that don't are probably too young to have them. Haha. I think it's a kind of obvious differentiation mechanism. Like hairstyles usually are in a lot of manga. I really want my characters to be unique. By that I mean that I want them to be unique from each other. I try to pay attention to every detail that defines a character... subtle stuff like skin tone, the slope of the nose, the curve of the eyebrows, the shape of the ears, and not so subtle stuff like height and weight. Like they say, "God is in the details." But regardless of the effort, I still find that hairstyle makes the greatest impact. ah poo~
3. Situational irony: best storytelling device ever(PERIOD)