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.
The Scrappy: 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.