What? No, not that stupid thing. I wouldn’t call it a cheese because you still have to be close enough to him and you might die of old age doing it that way.
I was thinking more along the lines of a Glass Cannon.
Respec to have at least 60 Faith and at least about 250ish Focus Points from your Attunement and the rest be Endurance or whatever.
Then just use the two Miracle boosting rings, Lightning Clutch, and the Red Tearstone Ring.
Get low health using the Bloodlust Katana (or by some other means which makes you low enough to get the benefit from the Red Ring).
If you have Morion Blade put that in one of your hands and use the Chime of Yorshka as your catalyst. (You get it from killing Yorshka, the Darkmoon Dragon Hybrid) The Blade will give you additional damage on top of all of your other rings and the Chime is the strongest in terms of raw damage with Lightning.
Use Tears of Denial and Sunlight Spear (or maybe the Lightning Arrow if you don’t have it). Use Tears when you get hit and just keep your distance but close enough to hit his head repeatedly.
Rinse and repeat and you should be fine. And be sure to convert all of your Estus to Ashen Estus (as you will not be healing during the fight).
It’s what I did the first time I fought him when I was on like NG+12.
If you have the Whip of Ariandel from the first DLC you can use that to lower your health and also give you a Damage Buff to your attacks (and you can switch to a different tool and still keep the buff).