MechaTarrasque
Hero
I think the DM Guide says that Arborea has elves that are celestials (so you can have a celestial elf archmage zap your PC's), Arcadia has dwarves that are celestials (so you can have a celestial dwarf archmage zap your PC's), Archeron has fiendish orcs and hobgoblins, and I don't recall if they said this, but I wouldn't be surprised if Bytopia has celestial gnomes.
Of course, having the PC's go all the way to the outer planes so they can fight orcs and hobgoblins that are basically the same as the ones that they were fighting on the prime material plane (except affected by more spells) is kind of a dud. It would be nice if there were some "extra special NPC classes associated with some of the outer planes" that you could stick those celestial/fiend elves, dwarves, orcs, hobgoblins, and maybe gnomes into.
Of course, having the PC's go all the way to the outer planes so they can fight orcs and hobgoblins that are basically the same as the ones that they were fighting on the prime material plane (except affected by more spells) is kind of a dud. It would be nice if there were some "extra special NPC classes associated with some of the outer planes" that you could stick those celestial/fiend elves, dwarves, orcs, hobgoblins, and maybe gnomes into.