1. Sailor Moon, Neon Genesis Evangelion, Revolutionary Girl Utena, Madoka Magika, Yuri Kuma Arashi and on Western front Steven Universe have a lot of symbolism that used to be widely analysed but little of that meta found its way to AO3. Critical analysis of popular media is also pretty rare.
2. Four total, though one is an ongoing anthology-like thing.
3. None.