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So after being hyped for Palentine Serena, now that's I've gotten to use her, enemy speed control is just not worth the hassle. Paralysis suffers from what all special conditions suffer from, in that all bosses usually have a pretty high immunity. And even if you get the opponent down to -6 speed, it's just not going to slow their gauge enough to justify the move turns you used up to get them there.
One thing I will say is that she does pretty good as a striker. She has a ton of damage multipliers available to her, so her attacks can do a lot of damage. Of course you have to set these up to reach max damage so it takes time if she's the only one setting these up, but once she gets rolling, her attacks hit pretty hard.