Alicornutopia

I'm not sure exactly how strong Captain America is but probably weaker than him.

How much variance in basics-granted physical ability is there? Is Flicker still clumsy relative to the average Gemini with no grace-related bonus?

There is some variance but it's all about practice and like, I want to say motor planning but that probably has a technical definition I don't mean. Flicker is probably not as fast a runner as the average Gemini because, like, she can teleport, and therefore doesn't rely on running much; but she doesn't have a practice-unrelated deficit in grace.

I gather that the-healing-at-sixteen isn't good enough to repair missing parts? How about donated organs or blood?

Gemini extra powers have an upper-limit?

If one of the Gemini set dies before the age of sixteen, their sibling(s) get powers with the "work well together" fuction based on whatever the lost sibling would have?

I don't remember weighing in on missing parts. Gemini can heal donated organs and blood.

I'm not sure what you mean by upper limit.

There is obviously no way to be sure that the bonus of a Gemini missing their twin would have worked well with their twin's, or even that these powers are set in advance.

I think with upper limit he's asking how powerful Gemini can get. Could a pair of them have, say, the power to scry the past and the power to go wherever either twin is looking?

I'm gonna say no, or at least not in a way that dovetails as obviously meant.

All the obvious questions about conjoined twins and chimeras: do they get powers? What about if conjoined at the head and partially sharing brain matter? Can conjoined twins do the sympathetic healing and can that cause separation? I imagine that even if chimeras get powers they can’t usefully do the healing?

I don't know about conjoined twins but I'm pretty sure this question has been answered for chimeras; they get basics but no extra powers.

Conjoineds get full on powers including healing and resulting separation.