Only for Pikachu. Not a human character.
In the beginning of XY, Ash was fine but then devolved into repetitive antics summed up to "GET STRONGER! MORE MORE STRONGER!", "SCIENCE IS AMAZING!", "insert generic inspiration words", and basic responses probably the sane time Clemont devolved into the background. There were moments where he was fine when it came to him interacting with his Pokemon like saying goodbye to Goodra but he was still portrayed as perfect and overly glorified by the people around him. It got to hilariously bad territory when they emulated Jesus Christ on the cross.
Ash is participating in the Island Trials and will be competing in the Pokemon League that Kukui will create.
Yes it is. It isn't a farfetched idea to say Ash went back home, spent time with his mother and Mimey until he found out what he wanted to do, went on vacation after Mimey won the lottery, and dropped off his remaining Pokeballs at Prof Oak's.
Ash left Kanto with Alexa and the only thing that seems to be calling XY a "true" successor to DP is because of how badass he battles. BW happened between DP and XY and SM happened after XY.
I wrote about how his character is being used in SM and you simply don't acknowledge it just because it isn't your vision of Ash.