Yes I have and to tell you the truth, while it heals and protects you... damage is more fun. It can make quick work with Emerald and Ruby although Ruby is so flawed once you cast hades no matter who is fighting him. One thing I know about having secret characters is that you can't take them everywhere or do everything because of crashes. If you are at your in-game then its fun though to play with other characters and build them up. It gave me something to do.

While I'm playing the games again, and having fun again, I would like to mention that Final Fantasy VII wasn't as clean when it came to cheating for extra characters. For 1, you get aeris like she was AFTER you lost her at the temple of ancients. That means she is stuck in there like she was before she left. Another thing is that while you can play as Sephiroth and Choco-Boy when you enter battle their HP falls straight down to 0. In Final Fantasy VIII you can do anything with Seifer and Edea but exclude important events and the dolet inn.