- Game-Breaker: Lina Inverse in her Lord of Nightmares mode. Don't believe me? Look for yourself and see.
- Goddamned Bats: The Gadget Drones. They might be slow and weak and die in one or two special attacks, but they can still interrupt you while you're charging, come in swarms that attack you from all directions, break you out of your super via their concentrated fire and tend to accompany Ruru and Nowel (themselves particularly annoying foes, especially Ruru).
- Memetic Mutation: Not the source of one, but StrikerS Nanoha's Desperation Attack is the product of one. Hint: See her pose in the main page's image.
- That One Boss: Ruru. She hits hard, fast and can interrupt your attacks if you get too close to her. Your best bet would be to keep your distance and spam super moves against her by disposing of her Gadget Drones to fill up your Charge Meter.
- In Nowel's scenario it gets worse as you not only have to fight Ruru, but also non-handicapped versions of Kirara, Sarara, Nanoha and Fate. Thankfully, you only need to defeat Ruru to win this fight.
YMMV / Magical Battle Arena