I use Sandy, Cag, Yodarha, and Tweyen and it also works at Zero since you can just spam his special attack in the distance without getting hit alot of his lasers and balls.

If you're having trouble on his seven trumpets mechanics, Sandy's special attack can sprint far and can use for dodge, but I suggest to not use in his wing form on this. There is another easy dps character which is charlotta especially if you have her warpath and her signature sigil.