sakura_(gentle_nekomata)_(fire_emblem)
Tag used for Sakura (Fire Emblem) from Fire Emblem specifically when dressed in her Halloween/"Harvest Festival" attire from the Fire Emblem Heroes 2017 Trick or Defeat! banner.
Note that it's possible (especially for older artwork), to depict Sakura in a Halloween costume without it being the one described above, in which case this tag should not be used.
TBU