Alicornutopia

Kappa you are adorable. After seeing this phrase (There are three base elements in this magic system. They are Joker, Sherlock, and Miles - *ahem* I mean, they are Earth, Air, and Light.") I kept substituting in my head as appropriate all throughout this thread.
Anyway.
Flora is very Air. She gets hit by the drawback really badly when she's having a meltdown but she gains a lot of strength too.
Amy is Light. How good she is at Light-ing depends on the importance of "deep" and "meaningful" in the relationship, but she is pretty good at not being hit by the drawback.
Zane is Wood. He gets Earth-drawbacked... pretty often, but when he isn't he draws strength from it. He's okay at both parts of Light.

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I've started naming characters now that I can run my language generator and use the internet at the same time!

The local Vorbarra-equivalents are the Fareine family, including Fareine Dekaral (Dorca), Fareine Orin (Yuri), Fareine Arozavei (Xav), Fareine Torvari (Ezar), Fareine Siurek (Serg), and Fareine Korovai (Gregor).

I don't have a surname for the Vorkosigans yet because I came up with one before I remembered that I wanted this to be a family-name-first society and "Kadirian" has a bad rhythm when put in front of these given names, but Piotr is Ferothrai, Aral is Aira, Cordelia is Kalevra, and Miles is being difficult. XD

edit: The Miles ceased to be difficult, and I renamed the Cordelia. The family is now Kadiran, populated by Kadiran Ferothrai, Kadiran Aira, Nysse Calantri, and Kadiran Ruava.

The Ges is (tentatively) Ravar Nirani.

I figured out how to do Not The Triforce! I am proud. It's kind of Venn-diagram-y but with all straight lines and a triangular silhouette, which is exactly the aesthetic I wanted.

Yay!
Are the triangular areas the single elements, the chevron the doubles, and the hexagon the triple?

Yes. If you look at it a certain way, it's made of three overlapping isoceles triangles. Those represent the three base elements. The chevrons are where two of those triangles overlap; the hexagon is where all three do.

It might be clearer if you colored those three triangles based on the element.

I tried that and I couldn't get it to be not godawful ugly.

?

Brown: earth
White: light
Gray: air

Blue: water
Green: wood
Red: fire

Yellow: deity
?

That set of colours fulfills "the parts are coloured in" but somewhat less "the parts are coloured in a way that makes it obvious how the overlap is supposed to work", I think.