What do these three characters have in common?

This is Ezio Auditore Di Firenze from the video game Assassin's Creed 2:

This is Yukari Takeba from the video game Persona 3:

And THIS is Luna (the cat) in human form from the Sailor Moon book series:

Any guesses? Any idea what these three characters might possibly have in common? Two are from video games and one from a book/TV series (although I'll state my Sailor Moon ignorance here that I don't know if this character was in both the books and the TV show... I know she is in the books.)

Wanna know? Really? You're gonna laugh... hysterically.

I've been asked to make and/or assist in making them as Halloween costumes! For this year!

Oh, I guess that hysterical laughing was coming from me.

Stay tuned!

Ezio is for Blake. Pretty cool costume, really, and something I'm hoping I can make with fabric from around the house and maybe some craft foam made to look like faux leather.

Yukari and Luna are for Erika and a good friend of hers. They're going to be attending an Anime convention (Oni-Con) that's coming to Houston on Halloween weekend. Erika wants to learn how to sew, so is thinking with some basic lessons from me she'll be able to make these two costumes... so we shall see.

Wish me luck... I think.

This isn't even counting any costumes needed for Paige and Dean... not sure if we'll make them though. I might already have enough on my plate.