The following are in no particular order:
- Witch - Cartomancer: I bought a Harrow deck just to play this one. Flavor is so good, especially for a Varisian witch.
- Rogue - Eldritch Scoundrel: Shades of the 3.5 beguiler, but having a skill monkey with practical, utilitarian spells is such a fun character to play.
- Magus - Eldritch Archer: Arcane Archer done right. This fills a specific niche that nothing else really does, spells through a ranged weapon.
- Paladin - Martyr: I really like the flavor of this one. I used it in an 'Oradin' build to really emphasize taking damage for the rest of the party. Having bardic performance tied to non-performance is nice, because personally I find the idea of bards rolling around the battlefield playing a lute kind of immersion breaking.
- Druid - Nature Fang: This one has been mentioned already, but I really like it as well. My favorite character of all time was a Lizardfolk Nature Fang; He took the crocodile domain, and focused on natural weapons and grappling/death rolling with his sneak attack. Probably not optimal by any means, but I love the idea of a druid who immerses themselves in nature by being an apex predator.
EDIT: I missed the part where Erik said 11 base classes so I included everything but Hybrids. Below are 2 additions to round out Core + Alchemist:
- Alchemist - Toxicant/Vivisectionist: Gives a really new flavor to alchemist outside of Dr.Jekyll/Mr. Hyde or mad bomber types. Could also be an alchemy flavored version of eldritch scoundrel as a rogue archetype.
- Druid - Tempest/Storm Druid: Love the flavor of a weather/storm focused druid. Lightning is fun, plus really fits with Gozreh. Not a huge fan of either execution entirely, but a mix of the two could be nice.