|Here, you have a perfect alternative with the worst combination of Ivs for Nina.
With this build she can have a well balanced spd and res, but not the best in the game and not the best for she, however, her Def its a petry oportune to save her from a physical atacks and her Res and Spd are very competitive to afront any magician.
Nina's mediocres Spd and Res, after use her skill Spd/Res link 3 in combination of Draw Black or Swap and Swift Stance 2 ascend to 44 points in same of then. The Best way to use she, its to counter a magical Attack in the turn of the enemy.
Even Spd wave 3 its to boost the allies and Herself, Flashing blade 3 can make a respetable combo with her Spd, Res, and Special Attack Glacies making a good lot of damage and with a fast charge.
With Luna, you have an universal choice to make a build with a classic special atrack, but it's a little wasting her potential for a devastating combo.
Nina have a rol of a perfect instrument in the game and know she and her habilities It's like keeping that instrument well tuned and playing a song in an orchestra