I think the anime fillers just decided that really annoying characters are funny due to characters like Ichiya being sometimes annoying because by god did I forget just how annoying Daphne is
What's funny is that the anime did the whole fake evil Gray thing in a filler arc way before the manga did.
So the anime changed when Wendy was introduced and where. We see her on a train in the anime with no motion sickness. Granted she could have used her magic to stop it but it gets less effective each time.
Rewatching Fairy Tail.
There is a fortune teller right near the start that mentions Juvia.
Zeref constantly mentioned.
Natsu couldn't get past Frieds age barrier because he IS over 80 years old
They didn't think would make it past 48 episodes but has so much foreshadowing
Calling it now Dead Rock is a prequel to Fairy Tail.
Yakuto is Acnologia.
When we first meet Acnologia, he is a doctor with no name and no real memory.
I feel like this will fully explain why he can revert back to a human in Fairy Tail