Are all Demons bad

Starts after the seven year skip
(Do not read if you don't want spoilers about past the skip)
What if a mysterious person wear a scaly looking cloak came into the new Fairy Tail guildhall.

Who are they and why do they smell familiar and act familiar to the 1st gen dragon slayers and did they just trip on nothing and fall?
What is the story story behind a mysterious ice mage?
Were all Etherious meant to kill Zeref?

More based on Bonds of the characters that action, but will still have fights in the story.

This is based on a story line for Fairy tail based on some characters I though of
Almost all of the baseline belongs to Hiro Mashima except some Ocs and one Dragon Slayer thing I got form a misunderstanding that will be noted in the story