Okay first thing first: A.N.A actually stands for Autonomous Nanotech Amplifier, not nano drive as I previously mentioned- my bad. Secondly, Ana grandma's tells her that "your body may be large but your true form lies within the nano amplifier in your back". Lastly, the Puppetmaster is the dude that you get your psychic badge from. He lives within nightmare city where you reunite with Aelita and re-meet Zetta. He's weird and knows a lot, and seems to be on our side. Everytime someone has a nightmare in grand dream city, they go to nightmare city. Flora is a Bladestar admin/leader/second in command, the radical group mostly comprised of extremists, idiots and greedy fucks. She's the grass type gym leader and depending on if you choose to expose her or not, you fight either her or her brother, Florin, for the gym badge. She bombs Cassandra- the corrupt grand dream city mayor with ties to team Xen- in the latest version. Erin and a fuckton of innocent people- including Bladestar grunts that volunteered? Maybe?- are caught in the crossfire.
You do get to play as her if you give a password to Amanda at the start of the game.