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lawsan + steven universe au!! // WCI spoilers
No concrete ideas of the specific gem they are, feel free to reply to this post with your ideas! Also a heads up that a bunch of these ideas are not SU-specific but rather from Land of the Lustrous, I've just ingrained both to be my gem au brain file and I can't differentiate some details anymore.
Law is a healer-type gem, a skillset passed down through generations of doctors. He never unlocks this skill in the traditional manner and has to navigate his powers without any professional support in the Donquixote household / with Corazon. His gem colours are yellow and black + the disease has left permanent white scarring on his gem and viltigo on his skin.
His gem placement is on the left of his chest, above the heart. It is well-hidden under most of his clothing. He has grown accustomed to limited sunlight exposure, making him function better than others in situation without sunlight but making him relatively frail otherwise.
Sanji is a lab-grown gem and manufactured to be a fighter-type gem model by Judge. For one reason or another, he doesn't come out as how Judge would like -- he's not brittle, sure, but he is not up to standard. By all means, he has the capacity of a regularly birthed gem.
As a lab-grown gem, he has an extremely well cut facet, which he uses to his advantage to trick people into letting him into high-end establishments. Reconnaissance!
His gem is deep blue, placement is on the back of his left hand.
For their meet-up, I can picture them being introduced while still stuck in their respective families. Judge and Doflamingo have their big fancy villain party and where Sanji and Law first see each other. They meet again years later, post-Corazon and post-Germa, both on the run. They team up because they have nowhere to go and think they'll be strong together.
Their first fusion is one forced in the chaos of battle. With no option left, they fuse and they crush everyone around, no witnesses.
Fusion is another tool at their disposal, they work hard to stabilise it. It's real valuable when people are looking for two people instead of one and they'll hit more than twice as hard if it comes to that.
Their fusion is characteristically tall, but their size is malleable. Their colours and predominantly gold and blue. As a fusion, their weapon is like a huge filet knife that can also set on fire.
Due to years of experience, they've stabilised themselves to appear normal -- the only anomaly is that they have 4 eyes, which are easily hidden under Law's hat.
FUSION DANCE! FUSION DANCE! Classical waltz let's go!
The inherent romance of knowing the other thoroughly and having the capacity to trust.