Oh gosh, I have so many world states planned, it's not even funny.
I'll start with the first 5, since that's all we can have right now.
So World State 01: The theme is "Girl Power". All female heroes. Some of the other world states ended up like this as well, but this is the only one where it's deliberate. So we start with Ophelia Mahariel, Dalish warrior, who romanced Alistair. They both survived due to Alistair performing the dark ritual with Morrigan, and went off to be Grey Wardens together, putting Anora on the throne. Lina Hawke, mage, friendmanced Fenris. She sided with the mages, but killed Anders. They'll be followed by a so-far unnamed female Adaar, rogue, who'll be romancing either Josie, Sera, or Blackwall.
World State 02: Theme is "LGBT". All the heroes are in same-gender relationships. Mai Surana, elven mage, is with Leliana (in my head, they're actually in a poly relationship with Zevran, but alas, that's not possible in-game). She put Alistair and Anora on the throne, and made Loghain a Grey Warden. (He made the ultimate sacrifice) Lex Hawke, rogue, friendmanced Anders, and sided with the mages, keeping Anders alive. They'll be followed by Engel Trevelyan, warrior, who'll be romancing Dorian.
World State 03: Theme is "Free Love". All the heroes romanced the more promiscuous LI. Tasha Aeducan, rogue, romanced Zevran. She put Anora on the throne and made Loghain a Grey Warden, and had him perform the dark ritual with Morrigan. Danae Hawke, warrior, rivalmanced Isabela, sided with the Templars, and killed Anders. They'll be followed by Eléonore Lavellan, mage, who'll be romancing Iron Bull.
World State 04: Theme is "Rogues". So... All rogue playthrough. Rokuta Tabris romanced Morrigan, performed the dark Ritual and eventually went through the Eluvian with her. He put Alistair on the throne. Nadare Hawke friendmanced Merrill, sided with the mages, and kept Anders alive. They'll be followed by Aariak Cadash, who will be romancing either Josie, Sera, or Blackwall (one of these options to be eliminated depending on who my Adaar ends up with).
World State 05: Theme is "Mages". Not only an all-mage playthrough, but an all-EXTREMIST-mage playthrough. Also corrupting all the Chantry boys. I haven't done this one yet, but my plans are Jote Amell, blood mage, romancing Alistair. She'll put him on the throne and remain as his mistress. (Dark Ritual performed) Fran Hawke, blood mage, will be rivalmancing Sebastian. She'll side with mages and secretly agree with Anders, but will still kill him because she's ambitious and wants to rule Starkhaven by Sebastian's side. They'll be followed by Mjrn Trevelyan, necromancer, who'll be romancing Cullen.
World State 06's theme will be warriors and all extremist templar supporters, but I don't have the characters fully planned out yet. I also don't have the themes for states 07 or 08 yet, but have a few of the characters and romances planned.