Seven symmetrical stripes: dark grey and light grey for the part that is not claimed, white for nonbinary and agender identities, and a centre colour naming the gender you partly hold — yellow for demigender in general, pink for demigirl, light blue for demiboy. The structure is settled; exact hex values vary a little between sources.
The stripes
7 stripes, top to bottom, with the hex value most sources reproduce.
#7F7F7FStripe 1 · top#C4C4C4Stripe 2#FBFF75Stripe 3#FFFFFFStripe 4#FBFF75Stripe 5#C4C4C4Stripe 6#7F7F7FStripe 7 · bottom
No designer is on record for this flag, so stripe meanings can’t be confirmed. Where the note above gives them, they are the ones commonly repeated; we don’t add to them.
Download
Vector, so it scales from a sticker to a banner without going soft.
About Demigender
A partial connection to a gender — enough to be real, not enough to be the whole answer.
Other flags in Demigender
3 more verified in this category.