In order:
Kobolds. A way better monster race to add than goblins, IMHO. And more interesting; you could certainly make them +Dex/+Cha, -Str, because Charisma is often considered the "dragon" stat and kobolds are known for their sorcerers, but I think +Int fits kobolds better and is more unique. I just really want kobolds that are balanced with the other races!
Tengu. I just like 'em a lot.
Orcs. I'm not like, super interested in orcs, but honestly I think they need to be Core. Then we'd have humans and halflings, elves and gnomes, orcs and goblins, and dwarves as their weird part-medium, part-small thing. They'd also be good because no Core ancestry has a natural Strength boost or an Intelligence flaw, so they're unique in both ways! +Str/+Wis, -Int, probably!
And then... I dunno. Centaurs?