No one ever expected Harry to come out as aro. Everyone knew he was bisexual but he didn't even figure out he was aro until Luna and Cho organized an LGBTQIA+ education seminar in the room of requirement. After Luna came out as aroace q-platonic and Cho told her that she had never heard of it, Luna gave her a few books on LGBTQIA+ history and explained some identities outside of the L/G/B/T part of the initialism. Cho realized that what she thought was wrong with her was just being aroace (1/2)
After she discovered her own identity, one she never would have figured out if muggle-studies-loving, passionate, humanitarian Luna hadn’t enlightened her, she breathlessly told Luna, “No one is going to teach this stuff here. You and I have to do it. We have to teach our friends that these identities don’t make them broken. We need to tell EVERYONE.” So, during a DA meeting, Luna and her new QPP Cho taught their first lesson. Soon after that pride flags, mostly aro ones, took over Hogwarts. -S
Thanks for our awesome first Aromantic Spectrum Awareness Week prompt response!