My choice for the anniversary ticket has been Halloween Lady Grey like I mentioned multiple times in the past because she completes my dark stamina team and makes it extremely powerful.
I still need to uncap Ferry's weapon to complete the grid, but will do that once the Cagliostro rerun starts and I get another dama bar from it.
Lady Grey is a buffer/debuffer that gives extremely powerful buffs to increase sustain and damage of any dark grids.
Her kit is:
1) First skill has Party wide Drain, Death's grace (turn based damage turns into healing) and 20% charge boost.
2) Her second skill inflicts 10% def down stackable to the enemy (up to 30%). All allies gain an undispellable permanent buff called Everfall that raises def by 15% (stacks up to three times to 45%).
3) Her third skill gives a character of your choice an up-to 4000 health shield + 30% echo that lasts until that character takes damage.
4) Her passive gives 30% CA Dmg and 5% CA Dmg Cap to all allies with Drain
5) Her ougi gives party wide stamina buff (20% at max health)
As you can see her kit is incredible and has synergy with both Ferry (Grand) and Clarisse (Valentine). I always dreamed of dark escaping from the clutches of Enmity, but well...they did it. This is perfect!
I'm going to try harder bosses in the coming days with this same combination.