Agender
Definition
Umbrellas
Transgender
Nonbinary
Related Identities
Transgender: Someone with a gender identity that doesn't match their perceived gender
Nonbinary: Someone who's gender doesn't fit into male or female
There are likely other flags, and many indeviduals make alternitives that they like, you are not limited to just these options, but they are the more popular and well known ones. If you would like any alternatives that aren't listed here please feel free to contact R on tumblr.