Tesoro is like Budget Doflamingo with Kuma's backstory ๐
Tesoro was pretty cool tho, like a JoJo character. Plus, if he was a canon character, he'd easily be a high high tier or even an inbetweener. Dude legit clashed with Leo Rex Bazooka which is stronger than KKG and his awakening was really powerful.
All of that stuff whilst being nerfed by the way. On his island, he controlled all gold, even if it's turned to dust. That's why he easily negged Zoro and Luffy with no issues. They needed to cut his gold sources to have a chance at beating him.