Not in substantial numbers, but the same is true of Golarion.
Take Shadow Absalom's population (the biggest city on the plane):
- 51k Fetchlings
- 25k Material plane humanoids
- 10k D'ziriaks
- 6k Intelligent Undead
- 10k Others
No good creatures are listed, but also if we look at the same stats for Absalom, we similarly find no good creatures listed.
There are likely fewer on the shadow plane than there are on Golarion, due to it's association with Zon Kuthon and the Negative Energy Plane. Paizo may have been clear that there are practical and good uses for Negative Energy, but also they've been clear that it is what powers undead, and that good undead are incredibly rare -- going by adventure paths they are rarer even than good demons and devils (this is because undead have the afterlife as an option, and secondly because Positive Energy is the force of creation and creativity - things Undead lack, which makes seeing things from other perspectives hard -- this is well explored in the Pathfinder Tales: Bloodbound novel, and the nature of Positive Energy is touched on in Pathfinder Tales: The Redemption Engine).
In general good species are less frequently listed or described in Bestiaries, Adventure Paths, and other books than evil creatures. This is because players are less likely to encounter them, and even less likely to encounter them in such a way that the GM needs their stats.
There are likely some - particularly as it is a planar trading hub*. But probably fewer than for Golarion.
*From the wiki, Shadow Absalom's main trading partner is Absalom - and the ruler of Shadow Absalom places a high importance on maintaining trade.
