You can paint your single-player Moogle each time you visit a Nest. Mog will cast spells, and its color determines the spell it is likely to cast: Fire (Red), Blizzard (Blue) or Thunder (Green). The color of your Moogle also decides your Game Boy Advance Radar: Terrain (None), Monster (Red), Treasure (Blue) or Scouter (Green). The latter reveals monster stats.