Big-Lipped Alligator Moment: The battle with Dantarion. A GodzillaExpy that shows up for all of one mission, and despite every character in the game stating repeatedly that organic beings can't survive space travel due to Nectar Radiance, no one comments on the fact that you're fighting a living creature from another planet nor speculates how it could have gotten there. And to top it off, it's the only one you fight, and the incident is never mentioned again.
Game-Breaker: Laguiole's speed and airborne Fortress Mode allow it to intercept Volgara long before they can cause much collateral damage, and it can punch fast enough to land an enemy flat on its back while they're still winding up. To top it off, it's the only Meganite with a ranged alt-weapon that draws from its energy reserves instead of ammo, and hits hard enough to topple anything hit by it. It can even jump high enough to vault over the enemy and land behind them.
Les Yay: Nanao is a possible love interest for either of the male protagonists. Her dialogue changes very little if you're using the female character, Yui.
Narm: The English voice acting is laughable but Nanao's line "A robot killed grandma..." takes the cake.
Never Live It Down: Nanao's shock and disgust at learning the Chairman is the controller of a Meganite, leading to the above line under Narm. Reading most comments on the game, you'd think she held that attitude for a large chunk of the game, but in truth she gets over it by the next mission she appears in. And despite her status as a Damsel Scrappy, she only needs to be saved twice out of the games 53 missions.
Nanao is generally not well-liked among the game's fans: the combination of her whiny attitude, constant need for saving, and God-awful voice acting has won her very few fans.
Likewise, Gllang is almost universally despised among the Meganite selection. Its gimmick is that its a Mighty Glacier with tons of weapons and attack power and a transformation to compensate, but it doesn't match the game because weapons are useless until the Volgara are nearly dead and the transformation only really helps in completely straight lanes. It doesn't help that Vavel can do the same thing with its Gigantic Booster upgrade WITHOUT being slow as crap and having a Super Mode.
For missions, "A Day At School" is an Escort Mission that requires you to defend a school from not one, but two Cyclone Harriers, one of the most annoying Volgara types in the game. And they spawn a long distance from the launch area, to boot.
For maps, Senjo New City Center is dense with large, expensive buildings that make navigation a pain, and you can forget about the special bonus once the robot fists start flying.