People had to apply. The goal was to select people from a broad variety of play styles from a wide variety of communities. So RP folks, pet battlers, PvP, solo casual, transmog, AH, Accessibility concerns/deaf/blind, etc. They represent themselves, given they are not elected reps.
You can learn about the program here https://news.blizzard.com/en-us/world-of-warcraft/23743182/introducing-the-world-of-warcraft-community-council
In December they went through apps and selected the first 30 or so. There was some drama when one decided to make himself the representative of the council (despite the other members saying it was a bad idea), open a Discord called the “seat of the council”, have it be unmoderated and make racist comments, etc. Also kind of spammy - then went on a streamer’s show and doubled down. Not on the council anymore.
The rest of the drama is focused on one person and I won’t get into it because I don’t do Discords and don’t know the details.
If you want to know about the 60 or so people on it you can head over to the Council forum. All discussions with the Devs of Blizz have to be there for full transparency.
Start with the Intro thread and you can see a wide variety of player types. Maybe someone will be similar to you interest wise.
The goal is to have around 100 people active and to keep rotating them as needed and/or every year.
And no, they don’t want just “yes men”.