introduction - i. philosopher's stone

Andromache Granger, older twin sister of Hermione Granger, is the natural witch to her twin's studious one.
The sisters complement each other - they're possibly polar opposites, so they balance each other out.

Andromache is the Delphinium to Hermione's Ranunculus.
Both are mildly toxic buttercup genera - Andromache is just much more extravagant.