Well, there's two ways in this, I think.
1. We meet in anime. That is, I'm an anime character in the series who meets Rosette. In that case my character is most likely in the lines of that pervy old research guy who makes those bullets. Soo...sneak-a-peek up the skirt.
2. I meet Rosette in real life. I'd probably just greet her politely.
...and desperately try to find an excuse for her to wear that lovely pink dress.
*shake shake*
*nosebleed*