They're not too dangerous, but they like to double attack and Aerith is the only one who can survive that. Of course, you can just use Mini to make them almost completely harmless, as seen in the second battle. I got a pretty nice MP boost from that level up.
Btw, I've been playing this game for nearly 20 years and I'm pretty sure I've never changed the menu colors, so I decided to give it a try.
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