Answer:
To act like the character Yuffie Kisaragi you must be very cunning, sneaky and eager to get your hands on one thing, materia. You're also very ignorant and selfish and only focus on materia as your objective. (This is why she steals from Cloud's party, to get materia from them) But you're not completely bad, you have a hyper, fun and funny side to you as well as a clumsy one at that. So the best advice on being Yuffie is to just, be cheery, annoying and sometimes a pain in the neck! Though, she is more likely to be on the cheery and hyper side than the other. :)