In FFVII theres 2 secret characters, Vincent Valentine and Yuffie Kisaragi i already made a instructable on getting Vincent so heres how to get Yuffie. You have to do a task to get them, a different one for each. Getting Yuffie is pretty easy so dont worry about doing to much work.

Step 1: Before You Can Get Yuffie....

Yuffie is only available after you go to the Mythryl Mines. Once youve been there, you can find her in any forest on the world map

Step 2: Fighting Yuffie

While walking in a forest on the world map eventually you will get into a fight with Yuffie. She is not that hard but the next part is hard. She will start talking to you but you HAVE to pick the right things to say or she will take something from you and run away

Step 3: Talking to Yuffie

As i said in the last step after fighting Yuffie you start to talk to her. But you have to pick the right things to say or she will take something from you and run away. What she takes away from you depends on how far you are in the conversation.

When talking to Yuffie this is what you have to say,
1. Not interested
2. petrified
3. Wait a second!
4. thats right
5. Lets hurry on

On the last one DO NOT pick "whats your name". Pick "Lets hurry on" and then Cloud and the rest of your party will walk away. Then she says wait dont you want to know my name and then you get to choose a name for her. Also, DO NOT save bfore talking to Yuffie or she will run away.

Step 4: You Got Yuffie!

Congradulations! after this you should be back on the world map so just pause and got to the PHS and put Yuffie on your team. Have fun!

Step 5: Wutai Sub-Mission

Now that you have Yuffie you are able to do an optional mission in Yuffies hometown of Wutai. When you go to Wutai after getting Yuffie she will take your materia and this whole sub-mission starts. Also Don Corneo from earlier in the game will be the villain of the sub-mission and the Turks Reno, Rude, and Elena will also play an important role. Also, if you do this mission, later in the game on the way to Hojos lab you will meet up with the Turks. If you did the Wutai mission you will get to choose if you want to fight them or not and if you havent done the Wutai mission you have to fight them. You can only go to Wutai once you get the Tiny Bronco plane.