Magical Girl Lyrical Nanoha ViVid/Fridge

Fridge Brilliance

 * Lutecia's transformation into a Genki Girl makes sense when you consider that among the Numbers Cyborgs, she spends the most time with Sein and Wendi, and this continues when she's in the rehabilitation center. Presumably, their cheery personalities gradually rubbed off on her, since she seems to like that part of them.