Orochi's (zoan, would fit his fighting style, hybrid form enhance his attacks, can die up to 8 times)
Moria's fruit would fit too (Nightmare Burgess). Or go a step further, Blackbeard blocks sunlight with his Yami, while they absorb the shadows of the RHP and many others, Nightmare modes for BB and his titanic captains. Sunlight is blocked. Free to go wild
For a long time I had Moria showing up in Wano, but Burgress getting the Shadow Fruit is kind of perfect. Gives him more durability, the ability to aid his Captain, and the ability to create minions in combat.
I love the symbolism there, too.
Luffy is the Sun God, and Zoro and Sanji can use fire based techniques
Blackbeard is darkness, and Shiryu is invisible like someone standing in the dark, while Burgess gets the Shadow Fruit itself.
Nighmare Burgess sounds AMAZING, give me that.