Aida is by far the most dangerous villian in Season 4
I just finished Season 4 and its so amazing. Aida goes from just being a normal boring voice assistant too an Android. Then she reads the DarkHold and becomes slowly corrupted by it. Then she imprisons everyone in Shield inside the Framework and gets Fitz to turn her into a real human being with tons of Inhuman powers. Once she becomes human she becomes an unstable god. She has almost all the inhuman powers except for maybe Hive's mind control powers and the only thing that can even hurt her is Ghost Rider. Ghost Rider is my favorite character of the whole series I wish he still showed up after Season 4. Im at Season 5 and the Kree are pretty dangerous, but Aida is still so far much more dangerous.
She and Radcliffe go from being villians whose only ability is super intelligent and manipulation too becoming a God