Fairy Tail theorys
Acnologia is the dragon of the apocalipse, so i think his element is darkness, and Zeref is the most evil wizard in history, my theory is:
Zeref is darkness dragon slayer, the first one.
Tenrou island went to Edolas, the exceed and Mystogan (Edolas Jellal) created a space-time potal to save them, and how do they knew?
Shagote, Charle mom ability:
Shagotte has the ability to predict which and when a certain human will die.
About Romeo magic... I think its some Fire-based technique, golden fire maybe...