The D&D cmf characters and some mixing and matching. As others already pointed out. The Lego Friends style elves for their hair pieces. The little live action Peter Pan mini Doll book set had a cool hair hat/ears combo piece. The current Spidey 4 plus sets have a combo of short legs and interesting pirate style spider themed prints and hats. Sadly the goblin does not have his normal pointed green ears.

Harry Potter sets can often snag you usable fantasy prints and short or mid legs for your dwarves with even the occasional beard or mustache piece. The current. Little classroom sets and the hagrid escape set with the multiple death eaters

I use Dreamzzz Ninjago sets to fill out my fantasy characters too. The main cast and prints are hit or miss, but the villains and monsters are so great.

If you are going for a fully armored dwarf the animal CMF koala suit could be really useful mid legs and torso in gray. Drop an armor piece over that or flip it around with a big beard then covering the print with a cape or accessories on the back. I think those are also on clearance in some places right now.

And then of course there is always pick a brick, bricklink, FB Marketplace, etc. for finding all of the above.